random
4,705 results, page 25

algebra
55% of the people in a town have brown eyes. you choose a random sample of 200 people to survey regarding their eye color. What is the mean and standard deviation of the proportion of people in your sample that have brown eyes? 
statistics
a random sample of 20 prices for summer sleeping bags was taken with a sample mean of $83.75 and a sample standard deviation of $29.97 a. Find a 95% confidence interval for the mean price of all summer sleeping bags. b. what is m i.e., what is the margin of error? 
Maths
A random sample of 1200 engineers included 48 Hispanic Americans,80 African Americans, and 204 females. Determine 90% CI for the proportion of all engineers that are a) female b) Hispanic Americans or African American 
Algebra 2
A card is drawn at random from a full pack of playing cards. It is not put back. A second card is then drawn from the same pack. (a) Find the probability that: (i) both cards are sevens (ii) neither card is a seven (iii) at least one seven is obtained 
Math Homework
In a clinical trial, a drug used to relieve pain caused side effects in 2% of the patients who took it. For a new trial, three patients were selected at random. Find the probability that all three of the patients had side effects 
Intro to stats
The duration of a random smile (in seconds) of an 8weekold baby can be modeled by a uniform distribution with a = 0 and b = 23 seconds. What is the probability a randomly chosen smile of an 8weekold baby lasts between 2 and 18 seconds? 
Statistics
In a certain class 27% of the students are lefthanded. suppose that a random sample of 53 students is selected. Find the mean number of lefthanded students in the class. Round your answer to the nearest integer. 
Statistics
Among companies doing highway or bridge construction, 80% test employees for substance abuse. A study involves the random selection of 10 such companies. Find the probability that exactly 5 of the 10 companies test for substance abuse. 
Statistics
In testing a new drug, researchers found that 20% of all patients using it will have a mild side effect. A random sample of 25 patients using the is selected. Find the mean and standard deviation of patients having a mild side effect. I know the mean is 25(0.2)= 5 but I’m ... 
Program Logic Design
create a flowchart that shows the logic for a program that generates a random number; then ask the user to think of a number between 1 and 10. The display then randomly generated number so the user can see whether his or her guess was accurate. 
stats
a random sample of 20 prices for summer sleeping bags was taken with a sample mean $83.75 and a sample standard deviation of $29.97 a) find a 95% confidence interval for the mean price of all summer sleeping bags b)what is m i.e. what is the margin f error? 
Math
If I have a random stack of 5 quarters, the 1st 3 quarters are heads. What is the probability the the 4th quarter would be another head What is the probability the the 4th quarter would be a tail Is there a way to show the probability or odds that you would continue to keep ... 
Statistics
A random sample of 50 students chosen from an elementary school with 400 students was found to have a mean allowance of $26 per week with a standard deviation of $8. Obtain a 98% confidence interval for the total amount of allowance money given to students in this school per ... 
stats
In a straight 3 lottery you choose a 3 digit number. A 3 digit number is chosen at random, If your number mataches you win $250. 1. There are two outcimes in the sample space($250,$0) using these write down a probability model for the straigjt pick three lottery. SOMEONE ... 
MathStats
The Acme Candy Company claims that 60% of the jawbreakers it produces weigh more than .4 ounces. Suppose that 800 jawbreakers are selected at random from the production lines. Would it be unusual for this sample of 800 to contain 418 jawbreakers that weigh more than .4 ounces? 
probability
The J.O. Supplies Company buys calculators from a Korean supplier. The probability of a defective calculator is 10%. If 15 calculators are selected at random, what is the probability that 4 or more of the calculators will be defective 
probability
We have two fair threesided dice, indexed by i=1,2. Each die has sides labelled 1, 2, and 3. We roll the two dice independently, one roll for each die. For i=1,2, let the random variable Xi represent the result of the ith die, so that Xi is uniformly distributed over the set... 
stats
Cushman and Wakefield accounting that the average annual rent for office space in Tampa was $17.63 per square foot. A real estate agent selected a random sample of 15 rental properties (offices) and found that mean rent was $18.72 per square foot and s= $3.64. At a= 0.05, test... 
statistics
According to the local real estate board, the average number of days that homes stay on the market before selling is 78.4 with a standard deviation equal to 11 days. A prospective seller selected a random sample of 36 homes from the multiple listing service. Above what value ... 
genetics
Consider a population where gene A come in two form, A1 and A2. This gene is not under selection and random mating occurs with respect to that gene and p= 0.5 and q= 0.5. What are the expected genotype frequencies in the next generation? To do this, you should find the ... 
Chemistry
Do gases follow any of these principles all the time? 1. The space between gas molecules is much larger than the molecules themselves. 2. Gas molecules are in constant random motion. 3. The average kinetic energy is determined solely by the temperature. 4. All collisions ... 
calculus
according to data released by the chamber of commerce of a certain city, the weekly wages of female factory workers are normally distributed with a mean of 575 and a standard deviation of 50. Find the probability that a female factory worker selected at random from the city ... 
Algebra
Click on "Explain" if you need help. A dart hits the circular dartboard shown below at a random point. Find the probability that the dart lands in the shaded square region. The radius of the dartboard is 5in, and each side of the shaded region is 3in. Use the value 3.14 for... 
Algebra
Click on "Explain" if you need help. A dart hits the square dartboard shown below at a random point. Find the probability that the dart lands in the shaded circular region. Each side of the dartboard is 15in , and the radius of the shaded region is 5in . Use the value 3.14 for... 
statistics
Suppose that the mpg rating of Passengers Cars is a normally distributed random variable with a mean and a standard deviation of 33,8 mpg and 3,5 mpg. Question : an automobiles manufacturer wants to build a new Passenger car with an mpg rating that improves upon 99% of ... 
Finite Math
An urn contains six red balls and five white balls. A sample of 2 balls is selected at random from the urn. What is the probability that at least one of the balls is red? 
Statistics
Suppose that 92% of all SFSU students own a cell phone. Find the probability that 7 out of 10 random selected SFSU students own a cell phone 
math probability
Four balls are selected at random without replacement from an urn containing three white balls and five blue balls. Find the probability that two or three of the balls are white. 
Maths
There are 12 balls in a bag, where n of them are white balls. If 2 balls are chosen at random from the bag without replacement, the probability of choosing at least 1 white balls is 19/33. Find n. 
math
One card is selected at random from a standard 52card deck of playing cards. Find the probability that the card selected is a red king. 1 out of 26, There are 2 red kings in 52 cards so it would be 2 / 52 and then you sipmlify to 1 / 26 
Math
In a clinical trial, a drug used to relieve pain caused side effects in 7% of the patients who took it. For a new trial, two patients were selected at random. Find the probability that neither of the patients had side effects 
College math
Each inidividual letter of the word Tallahassee is placed on a piece of paper and all 11pieces of paper are placed in a hat, if one letter is selected at random from the hat, determine the probability that the letter T or F is selected. 
math
A store owner receives 12 computers:nine are model A and the rest are model B.if two computers are sold at random,find the probability that one of each model is sold. (base on probability and combinatorial analysis) 
math
In a clinical trial, a drug used to relieve pain caused side effects in 9% of the patients who took it. For a new trial, three patients were selected at random. Find the probability that none of those patients had side effects. 
statistics
based on a random sample of 640 college students, the mean amount of sleep college students. construct a 95% confidence interval for the mean amount of sleep per night for college studenrs. 
Finite Math
A law firm has thirteen senior and nine junior partners. A committee of 6 partners is selected at random to represent the firm at a conference. What is the probability that at least one of the junior partners is on the committee? 
statistics
A professor knows that in her class 37% of the students have passed an Algebra course, 29% have passed an English course, and 21% have passed both courses. If one student is selected at random from this class, find the probability that: c) the student did not pass algebra. 
prob & stat
In a simple random sample of 90 patients who saw a certain dentist, 8 patients had their teeth whitened. What is the 95% confidence interval for the percent of all the dentist's patients who had their teeth whitened? show work (5.9, 11.9) (4.0, 13.8) (3.0, 14.8) (1.2, 16.6 
college math
each individual letter of the word Tallahassee is placed on a piece of paper and all 11 pieces of paper are placed in a hat. If one letter is selected at random from the hat, determine the probability that the letter T or E is selected. 
statstics
a report says 65% of vechiles sold were SUV's. A random sample of 100 vechiles sold in last month is taken. Use the central limit theorem, find the probability that most 70% of the vechiles in the sample were SUV's 
Probability
Consider the following joint PMF of the random variables X and Y: pX,Y(x,y)={1/72⋅(x2+y2),if x∈{1,2,4} and y∈{1,3}, 0, otherwise}. 1. P(Y<X)= 2. P(Y=X)= 3. Find the marginal PMF pX(x). pX(1)= pX(2)= pX(3)= pX(4)= 4. Find E[X] and E[XY]. E[X]= E[XY]= 5. var... 
math
1. Jennifer writes the letters MONTANA on cards and then places the cards in a hat. What is the probability of picking an M? (1 point) onesixth oneseventh The fraction is 6 over 1. start fraction 7 over 1 end fraction 2. Jennifer writes the letters MONTANA on ... 
Statistics (Math 210)
Hi there, I am working on a few homework assignments and having trouble with a few questions. I sincerely appreciate any and all help! :) A bank claims that the mean waiting time in line is less than 4.1 minutes. A random sample of 60 customers has a mean of 4 minutes with a ... 
5th grade math
Samara keeps her collection of hair bows in a box. She has 20 white bows, 20 red bows, 15 yellow bows, 25 green bows, and 20 pink bows. If she pulls out 1 bow at random, what is the probability the bow will be yellow? Can someone show me how to work this problem out? 
Math
The Acme Candy Company claims that 60% of the jawbreakers it produces weigh more than .4 ounces. Suppose that 800 jawbreakers are selected at random form the production lines. Would it be unusual for this sample of 800 to contain 386 jawbreakers that weigh more than .4 ounces... 
Lincoln College Of New En
it has been found that 85.6% of all enrolled college and university students in the U.S. are undergraduates. A random sample of 500 enrolled college students in a particular state revealed that 420 of them were undergraduates. Is there sufficient evidence to conclude that the ... 
Statistics
In a certain city, there are 10,000 persons age 18 to 24. A simple random sample of 500 such persons is drawn, of whom 200 turn out to be currently enrolled in college. Find a 90% con¯dence interval for the percentage of persons age 18 to 24 in the city who are attending ... 
statistics
the weights of shells follow a normal distribution. a random sample of 12 hybrid shells a a mean weight of 1.7 pounds with standard deviation 0.24 pounds. Find a 95 % confidence interval level for the mean weight if the fall catch is within 0.1 pounds of the sample estimate 
statistics
Let x denote the time taken to run a road race. Suppose x is approximately normally distributed with a mean of 190 minutes and a standard deviation of 21 minutes. If one runner is selected at random, what is the probability that this runner will complete this road race in 225 ... 
statistics
The distribution of weekly salaries at a large company is right skewed with a mean of $1000 and a standard deviation of $350. What is the probability that the sampling error made in estimating the mean weekly salary for all employees of the company by the mean of a random ... 
statistics
An architect estimates that the average height of the buildings of 30 or more stories in Suva is at least 500 feet. A random sample of 12 buildings is selected, and the heights in feet are shown. At = 0.025, is there enough evidence to reject the claim? 634 385 411 ... 
Statistics
A random sample of 90 observations produced a mean that = 25.9 and a standard deviation s =2.4 (a)Find a 95% confidence interval for u (b)Find a 90% confidence interval for u (c)Find a 99% confidence interval for u (Use integers or decimals for any number in the expression. ... 
Statistics
During the month of July, an auto manufacturer gives its production employees a vacation period so it can tool up for the new model run.In surveying a simple random sample of 200 production workers, the personnel director finds that 38% of them plan to vation out of state for ... 
statistics
Suppose babies born in a large Hospital have a mean weight of 4088 in a variance of 5569. if 128 babies are sample that a random from the hospital what is the probability that the mean weight of the sample babies would differ from the population mean by less than 41 grams ... 
Algebra 2
A simple random sample of 50 adults was surveyed, and it was found that the mean amount of time that they spend surfing the Internet per day is 54.2 minutes, with a standard deviation of 14.0 minutes. What is the 99% confidence interval for the number of minutes that an adult ... 
Statistics
The distribution of weekly salaries at a large company is reverse Jshaped with a mean of $1000 and a standard deviation of $370. What is the probability that the sampling error made in estimating the mean weekly salary for all employees of the company by the mean of a random ... 
statistics  math
Sixty percent of the students at a particular community college are female. If 13 students at that community college are selected at random, find the probability that 5 or 6 students will be female. Use Appendix Table or Excel function for Binomial distribution. [Remember from... 
tempe
An April 15, 2002 report in Time Magazine stated that the average age for women to marry in the United States is now 24.5 years of age. If the standard deviation is assumed to be 4.1 years, find the probability that a random sample of 32 U.S. women would show a mean age at ... 
Statistics
An April 15, 2002 report in Time Magazine stated that the average age for women to marry in the United States is now 24.5 years of age. If the standard deviation is assumed to be 4.1 years, find the probability that a random sample of 32 U.S. women would show a mean age at ... 
physics
A hiker makes four straightline walks A 31 km at 299 degrees B 32 km at 210 degrees C 29 km at 59 degrees D 22 km at 150 degrees in random directions and lengths starting at position (41 km, 41 km). Which vector will return the hiker to the starting point? All angles are ... 
Probability
Random variables X and Y are distributed according to the joint PDF fX,Y(x,y) = {ax,0,if 1≤x≤2 and 0≤y≤x,otherwise.} 1. Find the constant a. 2. Determine the marginal PDF fY(y). (Your answer can be either numerical or algebraic functions of y). For 0&#... 
probability
Random variables X and Y are distributed according to the joint PDF fX,Y(x,y) = {ax,0,if 1≤x≤2 and 0≤y≤x,otherwise. 1 Find the constant a. a= 2 Determine the marginal PDF fY(y). (Your answer can be either numerical or algebraic functions of y). For 0&#... 
Maths
What are 3 5digit numbers that have the sum of their digits equal? Is it as simple as finding a random 5 digit number than switching the number order and making 2 new numbers with the same digit sum? thank you 
statistics
If 30% of people in an area are registered voters and 15 people are selected at random from the area: A. what is the probability that at most 3 out of the 15 people are registered voters? B. could we have used the normal approximation to the binomial in part b? Explain why or ... 
AP Stats
The mean weight of pears grown in a certain orchard is 6 ounces with a standard deviation of .5 ounces. A random sample of 30 pears is selected. What is the approximate probability that the sample mean weight is less than 5.5 ounces? 
statistics
From a shipment of 350 batteries, a sample of 125 was selected at random and tested. If 25 batteries in the sample were found to be dead, how many dead batteries would be expected in the entire shipment? 
math
In a bag there are red, green, black,and white marbles. If there are 6 red, 8 green, 4 black, and 12 white and one marble is to be selected at random, what is the probability it will be white? I don't know how to solve these. 
math
bottles of thesame sizes produced in a factory are placed in boxes. each box contains 10 bottles. if 8% of the bottles produced are defective, find the probability that a box chosen at random contains at least three defective 
statistics
60% of the students at a college are female. If 13 students at that college are selected random, find the probability that 5 or 6 students will be female 
Math
you have four $1 bills, two $5 bills, five $10 bills, and five $ 20 bills in your wallet. You select a bill at random. Without replacing the bill, you choose a second bill. What is P($1, then$ 10)? 
MATH HELP!
HELP! I REALLY NEED HELP IN BASIC SKILLS MATH! Can you please find me a GOOD web site that will help me in random basic skills math? 
hard probability question
four different written driving tests are administered by the MVD. on of these four tests is selected at random for each applicant for a drivers test. if a group consisting of two women and three men apply for a license, what is the probability that a. exactly two of the five ... 
Statisitcs
The mean height of fully grown birch trees are 18 feet with a standard deviation of 1.2 feet, normally distributed. Random samples of size 9 are drawn from this population and the mean of each sample is determined. Find that mean and the standard error of the mean, and the ... 
statistics
Use the given confidence level and sample data to find a confidence interval for the population standard sigma. Assume that a simple random sample has been selected from a population that has a normal distribution. salaries of college graduates who took a geology course in ... 
Math
A swim team consists of 7 boys and 5 girls. A relay of 4 swimmers is chosen at random from the team members. What is the probability that there are 3 boys on the relay team given that there is 1 girl on the relay team. Express your answer as a fraction in lowest terms or a ... 
algebra 2b
A simple random sample of 50 adults was surveyed, and it was found that the mean amount of time that they spend surfing the Internet per day is 54.2 minutes, with a standard deviation of 14.0 minutes. What is the 99% confidence interval (zscore = 2.58) for the number of ... 
HELPmath
Of one hundred students surveyed: 70 like basketball, 52 like football, 61 like baseball, 29 like baseball and football, 39 like football and basketball, 42 like basketball and baseball, 27 like all three sports. If a student is chosen at random, what is the probability that ... 
math
Of one hundred students surveyed: 70 like basketball, 52 like football, 61 like baseball, 29 like baseball and football, 39 like football and basketball, 42 like basketball and baseball, 27 like all three sports. If a student is chosen at random, what is the probability that ... 
Math
Can someone guide me with this question? Four teachers and five students have volunteered to serve on the school's fundraising committee, which is chaired by the principal. The principal wishes to select the committee using a random draw. He places each person's name on a slip... 
Can you check an answer for me?
There is a jar with 16 marbles. 4 are red, 7 are blue, and 5 are green. You select two marble at random. One marble is drawn and not replaced. Then a second marble is drawn. What is the probability of selecting a red marble and then another red marble? a. 3/64 b. 1/4 c. 1/20 d... 
MATH
You have five $1 bills, four $5 bills six $10 bills and three $20 bills. You select a bills at random. Without replacing the bill, You choose a second bill. What is P($1, then $10)? 
MATH
You have five $1 bills, four $5 bills six $10 bills and three $20 bills. You select a bills at random. Without replacing the bill, You choose a second bill. What is P($1, then $10)? 
onethird done with new forum
I worked on the new forum all day yesterday. It should be done by the end of tomorrow. There won't be any visual changes, but the forum should load even faster. Also, that silly random error message will stop occuring. Wonderful! Keep up the good work. DAG We ALL appreciate ... 
Statistics
A study conducted by an airline showed that a random sample of nine of its passengers disembarking at the Cleveland airport, took an average of 24.1 minutes to claim their luggage. From a previous survey it was willing to assume that time to claim luggage is normally ... 
Statistic
A basketball player makes 80% of her free throws. Recently during a very close game, she shot 5 free throws near the end of the game and missed 3 of them. The fans booed. What is the probability of her missing 3 (or more) free throws out of 5? Set up and conduct a simulation (... 
statistics
List below are the duration (in hours) of a simple random sample of all flights of a space shuttle program. Find the range, variance, and standard deviation for the sample data. Is the lowest duration time unusual? Why or hwy not? 73 95 238 199 166 268 198 374 260 235 382 339 ... 
ap stats
based on over 800 housing prices collected at random from the city of Los Angeles, an investigator constructed a histogram and found that the distribution of housing prices was heavily skewed to the right. Which of the following statistics will best represent the center of ... 
English
Hey, Any ideas on how to make your own fairytale? I've already started but all i have is a couple of random paragraphss. I wasnted to make it instead of a happily ever after the hero leaves the heroin, but i want them to both have a strong love. And I don't have any love ... 
Experiment
the experiment that would allow establishing causeeffect relationship between number of hours worked per week and lower college graduation rates has to have these components: a manipulated independent variable, a dependent variable, control for extraneous variables, an ... 
Statistics
A newspaper article stated that college students at a local university spent an average of $95 on beer a year. A student investigator who believed the average stated was too high polled a random sample of 50 students and found a mean of $92.25 and s = 10 Use these results to ... 
MATH
(A) Classify the following as an example of nominal, ordinal, interval, or ratio level of measurement, and state why it represents this level: zip codes for the state of Pennsylvania (B) Determine if this data is qualitative or quantitative: Nationality (C) In your own line of... 
statistics
2. The Occupational Safety and Health Administration (OSHA) estimates that roughly 30% of all worker compensation claims stem from back injuries. This statement was made many years ago and you want to know if this has changed in recent years. Suppose you take a random sample ... 
stats of biologists
a manufacturer claims that the life time of a certain brand of batteries has a varaince of 5000(hours)^2. a sample of 26 has a variance of 7200(hours)^2. assuming that it is reasonable to treat these data as a random sample from a normal population, test the manufacturer's ... 
math
1) in a random survey of students, 152 students could swim and 48 could not. what is the probability that a student can swim? 2) suppose you spin two spinners, one marked 1 through 4 and the other marked A through E. how many possible outcomes are there? 3) an ice cream store ... 
statistics
A psychic was tested for ESP. The psychic was presented with 400 cards face down and was asked to determine if the card was one of four symbols: a cross, a star, a circle, or a square. The psychic was correct in 120 of the cases. Let p represent the probability that the ... 
Stats
Consumer Reports rated airlines and found that 80% of flights involved in the study arrived on time (that is, within 15 minutes of scheduled arrival time). Assuming that the ontime rate is representive of the entire commercial airline industry, consider a random sample of 200... 
Statistics
For some reason I didn't get the entire questions submitted on the previous email. I really need help with the last part  the part about the crusty old professor. THANKS. K Students in a very large first year college class at a prestigious college were asked how many minutes ... 
statistics
Consumer Reports rated airlines and found that 80% of flights involved in the study arrived on time (that is, within 15 minutes of scheduled arrival time). Assuming that the ontime rate is representive of the entire commercial airline industry, consider a random sample of 200... 
statistics
opinion polls find that 16 percent of americans adults claim that they never have time to relax. suppose you take a random sample of 400 american adults and count the number X in your sample and claim that they never never have time to relax. 
statistics
the quality control inspector of a production plant will reject a batch of syringes it two or more defective syringes are found in a random sample of ten syringes taken from the batch. suppose the batch contains 2% defective syringes. What is the probability that the batch ...