Monday

August 3, 2015

August 3, 2015

Number of results: 33,965

**Stats**

I have a test on this tomorrow and I swear he didn't teach this and the book's not helping either, so maybe u can: A hwy engineer knows that his crew can lay 5 miles of hwy on a clear day, 2 miles on a rainy day, and only 1 mile on a snowy day. Suppose that the probabilities ...
*November 14, 2012 by Jessica*

**Math**

1. A customer comes into Pierre's and orders a random assortment of 6 danish. At the time she comes in, there are 26 danish sitting out: 12 raspberry, 8 cheese, and 6 cinnamon. Assume the danish are not replaced. a) What is the probability that the third and fifth danish ...
*November 10, 2013 by Cece*

**math gcse probability**

Trevor and his 2 brothers and 5 friends are seated at random in a row of 8 seats at the cinema. What is the probability that Trevor has one brother on his immediate left and one on his immediate right? i need the workings
*February 28, 2009 by smart guy*

**Probability and Statistics**

The ACT scores of applicants to college are approximately normally distributed with a mean of 20.3 and a standard deviation of 3.1. If a random sample of 20 applicants to college is chosen find the probability that their average ACT score will be 19 and 21.
*April 29, 2012 by Kim*

**Probability**

Statistics show that about 5% of all males are colorblind. Suppose that 20 males are selected at random. What is the probability that at least 4 of the 20 people are colorblind? My answer: I got 1-0.984 The answer key says 0.00257394
*February 28, 2014 by Anonymous*

**Computer Science**

public class RandomPhoneNumber { public static void main(String[] args) { int num1=(int)(Math.random()*7); int num2=(int)(Math.random()*7); int num3=(int)(Math.random()*7); int set1=(int)(100+Math.random()*642); int set2=(int)(1000+Math.random()*8000); System.out.println("Your...
*October 30, 2012 by Sarah*

**PROBABILITY MATH**

An unprepared student makes random guesses for the ten true-false questions on a quiz. Find the probability that there is at least one correct answer. Could some one please help me? And explain to me how they got the answer? and is there another way besides the tree method?
*November 9, 2011 by HM*

**probability**

Suppose 1 person is picked at random from this group of dog owners. The probability that the person chosen is at least 50 years old and has at least 1 dog equals
*April 6, 2011 by shakara*

**Alegebra**

Can some one please help me with this 3 problems I have a hard time with probabilities I'm studying for my mid-term. Thank you 1) Urn A has balls numbered 1 through 7. Urn B has balls numbered 1 through 5. A ball is selected at random from urn A and then a ball is selected at ...
*September 11, 2009 by Jessi*

**math Study guide 3**

1. The table shows the results of spinning a four-colored spinner 50 times. Find the experimental probability and express it as a decimal. P(not red) = ? red | blue | green | yellow ----------------------------------------- 20 | 10 | 9 | 11 (1 point) a 0.6 b 0.4 c 0.2 <...
*June 6, 2014 by DragonBornFU5R0D48*

**check my work MATH**

1. The table shows the results of spinning a four-colored spinner 50 times. Find the experimental probability and express it as a decimal. P(not red) = ? red | blue | green | yellow ---------------------------------------- 20 | 10 | 9 | 11 (1 point) a 0.6 b 0.4 c 0.2 <...
*June 6, 2014 by DragonBornFU5R0D48*

**math**

Nine cards are numbered 1-9. what is the probability of drawing a number greater than 6 or an odd number. I know the answer is 2/3 but I don't know how you find the probability when it says "greather than 6 OR and odd number"... how do you calculate the OR?
*June 6, 2012 by martha*

**Math-Probability**

Michael is one of eight contestants entered in three races to be run on a eight-lane track. If in each race the runners are assigned to the lanes at random, what is the probability that Michael will be assigned to the inside lane at least once?
*March 16, 2012 by Emma*

**Math help. **

1. 1 • 12 numerical expression variable expression; a is the variable variable expression; there is no variable variable expression; l is the variable 2. f ÷ 7 variable expression; there is no variable numerical expression variable expression; g is the variable variable ...
*September 17, 2014 by Anonymous*

**mayh**

Four players are playing a game involving choosing positions on a grid of size 3×8. Each player chooses a random position on the grid, then all players reveal their choices and a token is placed on each of the positions. The probability that the tokens form the vertices of a ...
*May 5, 2013 by Mathslover Please help*

**math**

Four players are playing a game involving choosing positions on a grid of size 3×8. Each player chooses a random position on the grid, then all players reveal their choices and a token is placed on each of the positions. The probability that the tokens form the vertices of a ...
*May 5, 2013 by Mathslover Please help*

**Math Help**

Four players are playing a game involving choosing positions on a grid of size 3×8. Each player chooses a random position on the grid, then all players reveal their choices and a token is placed on each of the positions. The probability that the tokens form the vertices of a ...
*May 8, 2013 by Mathslover Please help*

**12 math**

there are 8 opposite sex married couples at a party. two people are chosen at random to win a door prize. A. what is the probability that the 2 people will be married to each other? B. what is the probability that the 2 people will be same sex? C. if 6 people are chosen whats ...
*October 8, 2008 by Linda*

**statistics**

Expected relative frequency probability represents a calculated probability based on large numbers of trials. In an example of a deck of 52 cards, where you randomly pull cards from the deck and record what they are, you find that over 1000 random draws, you pull an ACE 76 ...
*July 28, 2012 by carlos*

**Chemistry**

Would the value of molar absorbitivity value be greater, less, or equal for the absorbance of light at 550nm vs 650 nm?
*November 13, 2013 by Anonymous*

**Probability**

1) A group of students were asked about their itunes collection. The probability that a student had downloaded the album by group X was 33%. The probability that a student downloaded the album by group Y was 41%. However, if you only asked the students that downloaded the X ...
*January 17, 2013 by robson*

**Statistics**

Assume the weights of men are normally distributed having a mean of 185 lbs and a standard deviation of 17 pounds. A. Calculate the probability a randomly selected man weights less than 225 lbs B. Approximately 72% of men’s weights exceed how many pounds. C. In a random ...
*March 26, 2013 by Bill*

**Psychology Statistics**

Determine whether the numerical value is a parameter or a statistic? In a phone survey of 100 random homes in a country, 21 families had garages. Is this a parameter because the data set of 100 random homes is a population? Is this a statistic, because the data set of 100 ...
*September 9, 2011 by Margaret Sweet*

**Statistics**

There is a random selection of 150 students. What is the probablity that the sample percentage of correct identification is greater than 75%?
*June 18, 2013 by Katie*

**Statisitics:Standard Deviation of Population and o**

Standard Deviation of Population and of a Sample The weight of newborn children in the United States vary according to the normal distribution with mean 7.7 pounds and standard deviation 1.68 pounds. The government classifies a newborn as having low birth weight if the weight ...
*September 11, 2007 by Carma*

**pre-algebra**

Rewrite the equation so the variable is alone. Solve to find the value of the variable. 42=-2h Divide both sides by 2. Then change the signs of both sides. That will provide the answer. Possibly in 1 step: Divide by -ve 2
*March 15, 2007 by Julia*

**Math**

Find the following probability if z is a standard normal variable: P(z>1.62).
*June 16, 2011 by Jayce*

**Probability**

1.John puts the letters of the word FOOTFEST in 8 different envelopes. Paul chooses an envelope at random. (a)(i)Calculate the probability that Paul chooses an envelope containg letter O (1/8 ?) (ii)Calculate the probability tthat Paul doesn't chooses an envelope(5/8?) ...
*May 4, 2008 by Anonymous*

**Probability**

1.John puts the letters of the word FOOTFEST in 8 different envelopes. Paul chooses an envelope at random. (a)(i)Calculate the probability that Paul chooses an envelope containg letter O (1/8 ?) (ii)Calculate the probability tthat Paul doesn't chooses an envelope(5/8?) ...
*May 4, 2008 by Anonymous*

**stats again**

ok I get it, so once I get the prob figred for one person, how do I figure it if additional attempts are made and the question is about the prob of at least one of the additional attempts say n = 6 getting the same results as the first Once you have the probability of passing ...
*July 5, 2007 by holly*

**math**

Andre picks a card at random. Without putting the first card back, he picks a second card at random. What is the probability that both cards will be hearts. The cards showing are three hearts and two diamonds
*May 8, 2014 by Olivia*

**Qvntitative Methods**

CASE STUDY: 1 The bulbs manufactured by a company gave a mean life of 3000 hours with standard deviation of 400 hours. If a bulb is selected at random, what is the probability it will have a mean life less than 2000 hours? Question: 1) Calculate the probability. 2) In what ...
*September 25, 2013 by Sardar Hakim*

**Algebra**

a bag contains 13 marbles of which 10 are red. A marble is selected at random and replaced. A second marble is then selected at random. What is the probability that both marbles are red?
*July 23, 2009 by Joe*

**math**

A bag contains 13 marbles of which 10 are red. A marble is selected at random and replaced. A second marble is then selected at random. What is the probability that both marbles are red?
*March 9, 2010 by babygirl*

**Physics~ ONE MOREE**

Which of the following must the investigator measure during an experiment? independent variable dependent variable <<<<< controlled variable
*December 29, 2014 by May*

**Probability**

A boy forgot his password for his Internet gsme account. He has a total of 8 paaswords for various accounts. If he tries these passwords at random,one by one without repetition , what is the probability that he will log in to his Internet game account within 2 attempts ?
*February 10, 2014 by Anonymous*

**Probability**

A group of 90 students is to be split at random into 3 classes of equal size. All partitions are equally likely. Joe and Jane are members of the 90-student group. Find the probability that Joe and Jane end up in the same class.
*February 23, 2014 by qwerty*

**math study guide**

1. The table shows the results of spinning a four-colored spinner 50 times. Find the experimental probability and express it as a decimal. P(not red) = ? (1 point) a 0.6 b 0.4 c 0.2 d 0.3 2. You roll a number cube 20 times. The number 4 is rolled 8 times. What is the ...
*June 6, 2014 by DragonBornFU5R0D48*

**Stats**

The probability that a person has blue eyes is 16%. Three unrelated people are selected at random. a. Find the probability that all three have blue eyes: b. Find the probability that none of the three have blue eyes c. Find the probability that one of the three has blue eyes
*April 30, 2013 by Dave*

**probability**

Two six-sided dice each have the numbers 1 through 6 on their faces. Neither die is fair, but they are both weighted the same. The probability of rolling a certain number on one die is given in the table below: # 1 2 3 4 5 6 probability 1/6 1/6 1/9 ? 2/9 ? If the probability ...
*March 8, 2013 by Anonymous*

**math**

If a student is selected at random, find the probability a)
*March 25, 2007 by Carlos*

**science**

what is a control ,variable, independent variable, experimental variabale, dependent variable
*September 11, 2007 by hannah*

**Statistics**

The number of ships to arrive at a harbor on any given day is a random variable represented by x. The probability distribution of x is as follows. (Give your answers correct to two decimal places.) x 10 11 12 13 14 P(x) 0.37 0.09 0.05 0.14 0.35 (a) Find the mean of the number ...
*May 27, 2013 by Gayle*

**statistics help**

The number of ships to arrive at a harbor on any given day is a random variable represented by x. The probability distribution of x is as follows. (Give your answers correct to two decimal places.) x 10 11 12 13 14 P(x) 0.38 0.1 0.07 0.12 0.33 (a) Find the mean of the number ...
*June 15, 2013 by Kim5*

**Discrete Math**

12 A computer science department has a probability of 0.35 that a senior receives a job offer in IT before graduation. Random select 8 senior students • What is the probability that 5 students received offers before graduation? • What is the probability only 1 student received...
*April 30, 2015 by Peace*

**STATS**

A statistically significant F value means that: a) The influence of the independent variable is less than the error b) he observed differences between groups are due to individual differences of the values and the error c) An effect of the independent variable d) None of the ...
*October 4, 2013 by MArtina*

**Math**

Webster Aquatic Center offers various levels of swimming lessons year-round. The March 2005 Monday and Wednesday evening lessons included instructions from Water Babies through Adults. The number in each classification is given in the table that follows. Swim Lesson Types No. ...
*July 4, 2012 by Bob*

**math**

a basket contains the following pieces of fruit: 3 apples, 2 oranges, 2 bananas, 2 pears, and 5 peaches. Jameson picks a fruit at random and does not replace it. Then Brittany pricks a fruit at random. What is the probability that Jameson gets a banana and Brittany gets a pear...
*May 7, 2014 by help please*

**PROBABILITIES**

Factories A and B produce computers. Factory A produces 3 times as many computers as factory B. The probability that an item produced by factory A is defective is 0.037 and the probability that an item produced by factory B is defective is 0.05. A computer is selected at ...
*December 2, 2010 by cmb*

**6th grade math**

We are learning probability and can you please check my answer. Question: Enrique has 3 dimes, 2 quarters, and 5 nickels in his pocket. He takes one coin from his pocket at random. What is the probability that the coin is either a dime or a nickel? My answer is 8:10 which ...
*March 22, 2009 by Kathy*

**ALGEBRA**

Using x as the variable, write the equation or inequality that would correctly solve this problem. Eight times what number is greater than 72?
*June 25, 2014 by JD JOHNSON*

**math**

is this correct? 1.a jar contains 5 white, 15 violet,and 21 blue marbles. a marble is drawn at random. P(violet or white) answer: 5x15x21= 1575 15x5=75 75/1575= 1/21 2. a number from 10 to 16 is drawn at random. P(a number greater than 14) answer: 2/7
*April 8, 2010 by Jane*

**stats**

An analysis is done to determine the amount spent on fresh fruits and vegetables per person per week. In a certain area, assume this amount is normally distributed with a mean of $13.9 and a standard deviation of $ 4.91. A. When finding the probability that a random person ...
*October 10, 2010 by ff*

**Statistics **

1. A large video rental chain recently decided to change its rental policy, allowing an unlimited return date instead of requiring that movies be returned the next day. The marketing team reasoned that this would greatly increase the popularity of their stores, and also that ...
*November 22, 2010 by lina *

**statistics **

15. The probability that a recently offered stock by a technology company will double in value within the next three months is 90%. The conclusion regarding this probability estimate was reached based on the opinion of the experts in the technology field to which this stock ...
*June 30, 2015 by meri*

**Statistics**

Shopping Outlet A shopping outlet estimates the probability distribution of the number of stores shoppers actually enter as shown in the table below. x 0 1 2 3 4 p(x) 0.05 0.35 0.25 0.20 0.15 What is the probability that shoppers are just window shopping and not entering any ...
*March 11, 2015 by Anon*

**Reposted: Math (for "google"**

In many families both parents work, as a result there is increasing need for day care. Data was collected; and one year in Canada approximately 32% of children aged 0 to 11 years were in day care for at least 20h per week. What is the probability, in a random poll of 60 ...
*June 6, 2007 by Writeacher*

**statistics**

Healthy breakfast contains the rating of 77 cereals and the number of grams of sugar contained in each serving. A simple linear regression model considering "sugar" as the explanatory variable and "rating" as the response variable produced the following regression line: rating...
*September 19, 2012 by Gee*

**Math**

Use the table below to answer the following question. x: 1, 2, 3, 4 y: 1, 4, 9, 16 Which is NOT true about the above table? A: It shows a linear function. B: The variable x increases by 1 each time. C: The rate of change is not constant. D: The variable y increases by a ...
*May 12, 2015 by Krystal*

**statistics**

A clinical trial tests a method designed to increase the probability of conceiving a girl. In a study 306 babies were born, and 174 of them were girls. the sample data with a 0.01 significance level to test the claim that with this method, the probability of being a girl is ...
*November 25, 2013 by angela*

**statistics**

The taxi and takeoff time for commercial jets is a random variable x with a mean of 8.4 minutes and a standard deviation of 3 minutes. Assume that the distribution of taxi and takeoff times is approximately normal. You may assume that the jets are lined up on a runway so that ...
*February 18, 2014 by larae*

**stats**

Given a standard normal variable. What is the probability that z lies between 1.48 and 2.13
*April 2, 2013 by chris*

**stattistics**

The p-chart is based on the assumption that the number of defective units in each sample is a binomial random variable. Choose one answer. A. True B. False
*June 22, 2011 by bharat*

**BUSINESS STATISTICS**

The random variable x is normally distributed with mean =1,000 and standard deviation =100. Sketch and find each of the following probabilities: P(x<1,035)
*October 16, 2011 by Shirley*

**BUSINESS STATISTICS**

The random variable x is normally distributed with mean =1,000 and standard deviation =100. Sketch and find each of the following probabilities: P(x<1,035)
*October 18, 2011 by Shirley*

**statistics**

1. The scores on a standardized test for high school students are normally distributed with a population mean of 500 and a population standard deviation of 100. Use the empirical rule (0LI refers to this as the standard deviation rule.). Make sure you provide graphs for each ...
*February 3, 2013 by lay*

**statistics**

Find the test statistic, P-value, and critical value. Round to 3 decimal places. Claim: The mean IQ score of statistics professors is greater than 118. Sample data: n = 50, x = 120. Assume that σ = 15 and the significance level is α = .05 test statistic = P-value = ...
*April 8, 2014 by larae*

**Probability**

Let X and Y be independent random variables, each uniformly distributed on the interval [0,2]. Find the mean and variance of XY. E[XY]= - unanswered var[XY]= - unanswered Find the probability that XY≥1. Enter a numerical answer. P(XY≥1)= - unanswered
*May 26, 2015 by qwerty*

**Statistics**

The proportion of students who own a cell phone on college campuses across the country has increased tremendously over the past few years. It is estimated that approximately 90% of students now own a cell phone and 10% do not own a cell phone. Fifteen students are to be ...
*December 3, 2014 by Mackenzie *

**probability question - help!**

Two people agree to meet at a coffee shop. They each independently pick a random moment in time between 8 a.m. and 9 a.m. and show up exactly at their selected time. But they are very impatient, and only stay for 10 minutes after when they arrive. What is the probability that ...
*November 20, 2012 by mathfailure*

**math**

of a set of 10 cards, 3 have red circles, 4 have yellow triangles, and 3 have green diamonds. you choose one card at random and then replace it. then you choose a second card. what is the probability that both cards have yellow triangles? Find the probability of obtaining the ...
*April 16, 2007 by dillon*

**stata**

What is the probability that a person selected at random from data will be male?
*October 23, 2010 by shiela*

**math**

If a permutation is chosen at random, what is the probability that it begins with at least 2 A's?
*September 26, 2012 by bballer*

**FIND THE VALUE OF SQUARE**

I AM A NUMBER GREATER THAN 99 AND LESS THAN 1,000. TWO OF MY DIGITS THAT AREN'T NEXT TO EACH OTHER ARE THE SAME. MY TENS DIGIT COULD NOT BE GREATER AND IT IS 1 MORE THAN MY HUNDREDS DIGIT. WHAT NUMBER AM I?
*October 11, 2011 by ANDREW RAMIRES*

**math**

Bob catches a train to work every day from monday to friday. the probability that the train is late on monday is 0.45. the probability that the train is late on any other day is 0.3. A day is chosen at random. Find the probability it is monday and the train is late
*March 8, 2015 by neel*

**Math**

9 fair coins are independently tossed in a row. Let X be the random variable denoting the number of instances in which a Head is immediately followed by a Tail during these 9 tosses. The variance of X has the form ab, where a and b are coprime integers. What is the value of a+...
*April 20, 2013 by Ichigo*

**Math**

9 fair coins are independently tossed in a row. Let X be the random variable denoting the number of instances in which a Head is immediately followed by a Tail during these 9 tosses. The variance of X has the form a/b, where a and b are coprime integers. What is the value of a...
*April 20, 2013 by Zeneth*

**Math**

In the equation c=9h, identify which variable is the independent variable and which is the dependent variable.
*January 28, 2015 by Amy*

**Computer science**

If we have any five numbers. how do we find maximum and minimum number of those. You take the first number and store it in variable Min and Max. Then you take the second number. If that number is larger than the variable Max you overwrite Max and store that varible there. If ...
*December 15, 2006 by Sing*

**statistics/psych**

Find TWO media examples of two types of correlations (explained below). You will have to do some research to find these. Next: (1) Find one media example (don�t make up your own) of a correlation that could be argued to be spurious (third variable). Explain your media ...
*November 16, 2011 by ashley*

**Elementary Math**

The temperature of a cup of coffee is a discrete or continuous random variable? Am I correct " Discrete"
*August 8, 2009 by J.J.*

**Prob and Stats**

If X is a random variable with distribution X~N(350,110) find (a)P(X<400) and b)P(250<X<400)
*October 4, 2011 by Kathryn*

**algebra**

In a high school basketball game, a player on the home team makes two free throws. One student asks the student next to her what he thinks the probability of hitting two free throws in a row is. The student replies, "The probability of him making a free throw is probably about...
*September 22, 2014 by nautica*

**Statistics**

1) A Motor Company has purchased steel parts from a supplier for several years and has found that 10% of the parts must be returned because they are defective. An order of 25 parts is received. What are the mean and standard deviation of the defective parts? A) Mean = 3.5; ...
*February 15, 2009 by BEARHUG*

**stats**

For a normal population with µ = 100 and σ = 20: 1. What is the probability of a particular score being greater than 110? 2. What is the probability of a particular score being less than 50?
*October 23, 2012 by Komal*

**Math Probability**

A lottery game has balls numbered from 0 - 9 If a ball is selected at random, what is the probability of selecting an even numbered ball or a 5 ? I am guessing this is Mutually exclusive event and hence used the OR= P(A)+P(B) concept considering 0 as an even number I keep ...
*December 4, 2011 by HM*

**Statistics**

The probability that a parent will visit a restaurant after kids game is know to be .68 and assumed the same for all parents. Assuming customer visits are independent and identical, determine the probability that 5 of 7 parents selected at random visit the restaurant. ...
*September 25, 2012 by Puffy*

**Hypergeometirc Distribution**

From a lot of 12 flares, 4 are selected at random. If the lot contains 4 defective flares *flares that will not fire), what is the probability that all 4 will not work? What is the probability that at most 2 will not work?
*May 4, 2011 by Alicia*

**statistics**

In a state,52%of the voters supports party-R, and 48% supports party-D. In second state 47% of the voters supports party-D. Suppose 100 voters are surveyed from each state. Assume the survey uses simple random sampling. what is the probability that the survey will show a ...
*November 15, 2011 by johnprabhakaran*

**math answer check**

Patients who have artificial hip-replacement surgery experience pain the first day after surgery. Typically, the pain is measured on a subjective scale using values of 1 to 5. Let x represent the random variable, the pain score as determined by the patient. The probability ...
*June 1, 2013 by Nora 57*

**Statistics**

A variable is normally distributed with mean 68 and standard deviation 10. Find: a) The value that 85% of all possible values of the variable exceed. b) The two values that divide the area under the corresponding normal curve into a middle area of 0.90 and two outside areas of...
*April 13, 2015 by Janet*

**Calculus; Product Rule**

Find the value of dy/dx for the given value of x. a) y = (1 - 2x)(1 + 2x), x = 1/2 y' = 2(1 + 2x) + 2(1 - 2x) y' = 2 + 4x + 2 - 4x y' = 4 How do I find the derivative at x = 1/2 if there is no x variable to substitute the x value with? According to my textbook, the answer is -...
*April 29, 2008 by Anonymous*

**Mathematics**

Please help... In a 200 m swimming race between 8 boys, the probability of Omar winning the race if he is in one of the two outside lanes is 1/4. If he is in any of the other lanes, the probability of Omar winning is 1/3. If the lanes are drawn at random, what is the overall ...
*May 29, 2007 by Elizabeth*

**Calculus**

In the next questions, a particle is moving along a horizontal line according to the formula: s=2t^4-4t^3+2t^2-1 a) the particle is moving right when A. 0 is less than t is less than 1/2 B. t is greater than 0 C. t is greater than 1 D. 0 is less than t is less than 1/2, t is ...
*March 14, 2015 by Anonymous*

**Math check**

The number of ships to arrive at a harbor on any given day is a random variable represented by x. The probability distribution of x is as follows. (Give your answers correct to two decimal places.) x 10 11 12 13 14 P(x) 0.37 0.09 0.05 0.14 0.35 (a) Find the mean of the number ...
*June 2, 2013 by Nora 55*

**Math**

A toothpaste company did a survey at the mall. They found that 42.5% of those surveyed brushed their teeth twice a day. Which random numbers would you generate on a computer spreadsheet to simulate the survey? a. random integers from 425 to 1000 b. random integers from 1 to ...
*December 12, 2013 by Brandi*

**statistics**

Based on a random sample of 25 units of lawnmowers, the average weight is 102 lbs., and the sample standard deviation is 10 lbs. We would like to decide if there is enough evidence to establish that the average weight for the population of lawnmowers is greater than 100 lbs. ...
*October 5, 2010 by julie*

**Math**

If q is 20 percent greater than p, and p is 35 percent greater than 2,000, what is the value of q - p?
*August 22, 2011 by Amy*

**statistics**

The average temperature in households is 67.6 degrees F. The standard deviation is 4.2 degrees F. A random sample of 51 households is to be selected (a) What is the probability that the average of this sample will be above 68.3 degrees F? Probability = (4 decimal places) (b) ...
*February 25, 2011 by Anna*

**Probability/Statistics**

A quiz consists of 10 multiple-choice questions, each with 4 possible answers. For someone who makes random guesses for all of the answers, find the probability of passing if the minimum passing grade is 70 %. I'm not sure what to do. I figured that there's 10 questions, each ...
*July 11, 2009 by Amy*