# The standard deviation of the...

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statistics
CALCULATE THE PERCENTAGE OF CASES THAT FALL BETWEEN THE SCORES 120 AND 110 ON A NORMALLY DISTRIBUTED iq TEST WITH A MEAN OF 100 AND A STANDARD DEVIATION OF 10

statistics
Let X be a continuous random variable that is normally distributed with mean, µ = 15 and standard deviation, σ = 2.8, find a value xo that represents the 80th percentile of the distribution.

statistics math
MEAN ƒÊ=10 & STANDARD DEVIATION ƒÐ=2. FIND THE PROBABILITIES: 9.4 Ú X Ú 10.6 i have 2 different answers but am checking the answer. thank you one is 0.6179 the other is 0.2358

topics of math
A population is normally distributed with mean 43.7 and standard deviation 5.2. Find the following probability. (Round your answer to four decimal places.) p( x > 55.0 )

Statistics
Given the list 10,7,5,3,-6 find by hand, mean,meadian, midrange, mode(s), range, popvar, and sample standard deviation. (seven problems)

Statistics
Calculate the mean and standard deviation of the probability distribution created by rolling a dice. Either show work or explain how your answer was calculated.

statistics
Forty percent of participants in a soccer league are nine years old, 30% are eight, 20% are seven, and 10% are six. What is the expected value of the age and the standard deviation?

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)

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)

statistics
e Chebyshev’s theorem to find what percent of the values will fall between 226 and 340 for a data set with a mean of 283 and standard deviation of 19.

Statistics
Given that a sample is approximately bell-shaped with a mean of 60 and a standard deviation of 3, the approximate percentage of data values that is expected to fall between 54 and 66 is

Stats
Given that a sample is approximately bell-shaped with a mean of 60 and a standard deviation of 3, the approximate percentage of data values that is expected to fall between 54 and 66 is 75% 95% 68% 99.7%

statistics
if the mean is 250mg and the standard deviation is 75mg and 2% goes either right or left, what formula do i use to come out with a normal curve?

Statistics
he life expectancy of a lung cancer patient treated with a new drug is normally distributed with a mean of 4 years and a standard deviation of 10 months

statistics
"suppose that IQ scores have a bell-shaped distribution with a mean of 97 and standard deviation of 17.Using empirical rule, what percentage of IQ score are less than 46?"

statistics
A standardized test has a mean of 88 and a standard deviation of 12. What is the score at the 90th percentile? Assume a normal distribution. how would I solve? a. 90.00 b. 112.00 c. 103.36 d. 91.00

discrete distribution
Find the mean and the standard deviation of the number of hours parked. (Round your intermediate values and final answers to 3 decimal places.)

Stats
In a sample of 400 voters, 360 indicated they favor the incumbent governor. The 95% confidence interval? I can't figure out what to do without a standard deviation!!!!!!!!

Math
A district mathematics test for third-graders had a normal distribution with a mean of 74 and a standard deviation of 11. What percentage of students scored between 63 and 85?

Statistics
If a normally distributed group of test scores have a mean of 76 and a standard deviation of 10. Find the probability that student will earn a grade between 65 and 85

Statistics
Find the number x such that the proportion of observations that are less than x in a Normal distribution with mean 100 and standard deviation 25 is 0.3. (Use 2 decimal places.)

Statistics
An observation was drawn from a normally distributed population with mean 2.397 and standard deviation 0.612. If the observed value is 3.144, find the z-score.

ALGBRA
Consider the following test scores obtained by a class. Test score 90 80 70 60 50 Frequency 1 4 11 6 2 Find the standard deviation (rounded to the nearest hundredth). -------------------------------- I've posted this question earlier and I'm still getting the wrong answer. I ...

Math
Consider the following test scores obtained by a class. Test score 90 80 70 60 50 Frequency 1 4 11 6 2 Find the standard deviation (rounded to the nearest hundredth). -------------------------------- I've posted this question earlier and I'm still getting the wrong answer. I ...

statistics
Over the past several months, an adult patient has been treated for tetany (severe muscle spasms). This condition is associated with an average total calcium level below 6 mg/dl. Recently, the patient's total calcium tests gave the following readings (in mg/dl). Assume that ...

math
weekly take home pay for those 20 graduate teaching assistants from university z: 500.75, 217.43, 488.25, 405.78 485.46, 495.48, 370.75, 435.40 479.65, 482.56, 470.28, 489.90 382.50, 500.75, 465.32, 481.25 506.43, 225.50, 504.38, 179.25 1. what are the mean and standard ...

Statistics
A statistics professor gives a test and finds that the scores are normally distributed with a mean of 25 (out of 100) and a standard deviation of 5. She plans to curve the scores in one of two ways. 1) She could add 50 points to each grade. 2) She could use the following ...

Math
For a specific type of machine part being produced, the diameter is normally distributed, with a mean of 15.000 cm and a standard deviation of 0.030 cm. Machine parts with a diameter more than 2 standard deviations away from the mean are rejected. If 15,000 machine parts are ...

statistics
The Acme Company has developed a new battery. The engineer in charge claims that the new battery will operate continuously for at leas 7 minutes longer than the old battery. To test the claim, the company selects a simple random sample of 100 new batteries and 100 old ...

math
Calculate the range, standard deviation, and interquartile range for the data set: {-1, 0, 1, 2, -1, 0, 1, 2, -1, 0, 1, 2, 1, 1, -2}

Data and Statistics
Calculate the z score for an ACT score of 12, a mean of 20, and the standard deviation is 5.

statistics
if the mean is 20 and the standard deviation is 4, at least what percentage will have a mean between 15 and 25?

statistics
Mean class scored 74 w/ standard deviation of 4.3. What is range of scores for 68% of class?

Statisticis
16. Describe what is measured by the mean and what is measured by the standard deviation for a set of scores.

statistics
true or false The value for the standard deviation cannot be larger than the value for the range.

statistics
For a population with a mean of 80 and a standard deviation of 10, what is the Z score corresponding to an individual score of 95?

math
weekly take home pay for those 20 graduate teaching assistants from university z: 500.75, 217.43, 488.25, 405.78 485.46, 495.48, 370.75, 435.40 479.65, 482.56, 470.28, 489.90 382.50, 500.75, 465.32, 481.25 506.43, 225.50, 504.38, 179.25 1. what are the mean and standard ...

chemistry
Just..... don't get it A column packing for chromatography consists of a mixture of two types of particles. Assume that the particles in the batch being sampled are spherical with a radius of 0.5 mm. 36% of the particles appeared to be pink and are known to have a polymeric ...

statistics
For a sample with a mean of M=45, a score of x=59 corresponds to z=2.00.What is the sample standard deviation?

statistics
For a sample with a mean of M 45, a score of 59 corresponds to z 2.00. What is the sample standard deviation?

statistics
There are 20 numbers, the highest is 91, the lowest is 34. The mean is 60 and the standard deviation is 5. What are the 20 numbers?

statistics
There are 20 numbers, the highest is 91, the lowest is 34. The mean is 60 and the standard deviation is 5. What are the 20 numbers?

statistic
a population of n = 100 score has u = 30 and standard deviation =4 what is the population variance

Statistics
Find the Standard Deviation for this distribution of scores. Then find the z score for X=86. N=17 98, 92, 86, 84 , 76, 74 , 72 , 72, 72 , 70, 70, 66, 60 ,54, 32,30

statistics
what is the weight between 5.5 to 6 ounce when mean is 5,75 ounce and standard deviation is 0.11

statistics
Consider the following. (a) What percentage of a normal distribution is greater than the mean? (Give your answer correct to the nearest percent.) Incorrect: Your answer is incorrect. . % (b) What percentage is within 1 standard deviation of the mean? (Give your answer correct ...

Statistics
Consider the following. (a) What percentage of a normal distribution is greater than the mean? (Give your answer correct to the nearest percent.) Incorrect: Your answer is incorrect. . % (b) What percentage is within 1 standard deviation of the mean? (Give your answer correct ...

math
Consider the following. (a) What percentage of a normal distribution is greater than the mean? (Give your answer correct to the nearest percent.) Incorrect: Your answer is incorrect. . % (b) What percentage is within 1 standard deviation of the mean? (Give your answer correct ...

math
Suppose that people's heights (in centimeters) are normally distributed, with a mean of 170 and a standard deviation of 5. We find the heights of 60 people. (You may need to use the standard normal distribution table. Round your answers to the nearest whole number.) (a) How ...

math
A standard deck of cards is made up of four suits with 13 cards in each suits (total of 52 cards). If we randomly sample five cards from a standard deviation of \$6000. What is the cutoff salary for teachers in the bottom 10%? Answer choice: a) 5/2,598,960 b) 1287/2,598,960 c)...

statistics
A score that is 10 points below the mean corresponds to a z-score of z=-2.00. What is the population standard deviation?

Stats
True or false: The distribution with the largest range necessarily has the largest standard deviation.

statistics
In a distribution of scores, X=62 corresponds to z=+0.50, and X=52 corrsponds to z=-2.00. Find the mean and standard deviation for the distribution.

Statistics
In a given normal distribution, the standard deviation is 14.4 and 8.27% of the distribution lies to the left of 60. What is the mean?

statistics
A score that is 6 points below the mean corresponds to a z-score of z= - .50, what is the population standard deviation?

statistics
1. On a measure of anxiety, the mean is 79 and the standard deviation is 12. What are the z-scores for each of the following raw scores?

maths a
us e the formula z=x-u/SD to determine the z score for a score of 34.5 a normal distribution if the mean is 46.5 and the standard deviation is 8.7

Psychological Statistics
For a population with a mean of 80 and a standard deviation of 12, what is the Z score corresponding to an individual score of 92

math
a sample consists of the following n =6 scores: 2, 7, 4, 6, 4, and 7 compute the mean and standard deviation for the sample

statistics
Average is 8500 with a standard deviation. Of 1500 with a z score of -2.98 a z score of +1.00 what are the actual bonuses

Psychological Stats
For a population with a mean of 80 and the standard deviation of 12, what is the Z score corresponding to an individual score of 71?

Statistics
If the standard deviation of a sample is 12 inches, then the variance is 144 sq. inches. Do you agree? Can you try?

statistics
the correlation between two tests given to 100 students in the junior clas is .70 the mean for the first test was 125 with standard deviation 20 the mean of the second test is 80 with standard devation 10 a student took the first test and scored 100. what is your best estimate...

Math
The systolic blood pressure of 18-year-old women is normally distributed with a mean of 120 mm Hg and a standard deviation of 12 mm Hg. What percentage of 18-year-old women have a systolic blood pressure that is within 3 standard deviations of the mean on either side? Apply ...

finite math
1. what are the mean and standard deviation for this distribution of weekly take-home pay amounts? 2. what percentage of the pay amounts lie within 1 standard deviations of the mean? 3. what percentage of the pay amounts lie within 2 standard deviations of the mean? 4. what ...

Algebra
1)A bookshelf holds 4 mysteries, 3 biograpghies, 1 book of poetry, and 2 reference books. If a book is selected at random from the shelf, find the probability that the book selected is a biography or reference book. A)1/2 B)1/6 C)5/6 D)3/50 I chose A 5 bio/reference/10 total ...

math
If a group of data has a mean of 19 and a standard deviation of 77.8, what is the interval that should contain at least 88.9% of the data?

Statistics
How is finding the standard deviation a measurement of a data\'s center? my teacher said it measured the center...

math
calculate the range, variance, standard deviation, and interquartile range for the data set given {72, 80, 80, 82, 88, 90, 96}

Math
calculate the range, variance, standard deviation, and interquartile range for the data set given {72, 80, 80, 82, 88, 90, 96}

math
A set of data is normally distributed with a mean of 16 and a standard deviation of 0.03. What percent of the data is between 15.2 and 16?

Math
calculate the range, variance, standard deviation, and interquartile range for the data set given {72, 80, 80, 82, 88, 90, 96}

Statistics
A random sample is obtained from a normal population with a mean that equals 80 and a standard deviation that equals 8

statistics
If there are 200 students in a sample, and the mean = 45 and the standard deviation = 4. How many of these students will have a score under 41?

maths
A loaf of bread is normally distributed with a mean of 22 oz and a standard deviation of 0.5 oz. What is the probability that a loaf is larger than 21 oz?

statistics
if the mean of a test score is 30 and the standard deviation is 3.7. which score could be expected to occur the least often?

stastics
A population has mean 53 and standard deviation 12. Calculate the mean of x bar for a random sample of size 10.

psyc
A normal distribution has µ = 80 and standard deviation = 10. What is the probability of randomly selecting a score greater than 75 from this distribution?

statistics
the average score on the statistics quiz was a 70, and there was a standard deviation of 10 points. If the z-socre was -1.0 what is the percentile rank?

math
The test scores for a math class are shown below 83,85,82,93,83,84,95,87,86,94 what is the standard deviation of the data set?

statistics
there are 500 passenger with a mean age of 60 years and a standard deviation of 12. what is the minimum age of the oldest 20%?

TP
What is Standard Deviation? As in what does it measure, is it a measure of spread of a graph of results?

algebra 2
how do i set up data to find the standard deviation of the data?

algebra 2
how do i set up data to find the standard deviation of the data?

Math
what is a range, variance, standard deviation, and interquartile range

Statistics
What will adding 50 to each score in a distribution do to the standard deviation of that distribution?

variation
IF arithmetic mean is 10 and V(X)=4 find mean and standard deviation of z where Z=5x+4

statistics
An experiment was conducted to determine the abrasion resistance of a new type of automobile paint. Twelve different strips of metal were painted with the new paint. The abrasion resistance of each piece was then tested on a machine. In the sample, the abrasion resistance ...

statistics
A normal distribution has a mean = 100. Find its standard deviation if 17% of the values exceed 144. All I can say is wow. Book is of no help. Neither is teacher. Can anyone help?

Statistical Methods
The mean price of purchases is \$110 and the standard deviation = \$12. What is the probability of a purchase exceeding \$90? I need help reviewing. Please give some input.

statistics
Scores on a test are normally distributed with a mean of 68.2 and a standard deviation of 10.4. Estimate the probability that among 75 randomly selscted students, at least 20 of them score greater that 78.

Statistics
The high temperature X (in degrees Fahrenheit) on January days in Columbus, Ohio varies according to the Normal distribution with mean 21 and standard deviation 10. the value of P(X<10)is?

Statistics
The high temperature X (in degrees Fahrenheit) on January days in Columbus, Ohio varies according to the Normal distribution with mean 21 and standard deviation 10. the value of P(X<10)is?

Trig. Math
The mean score on a normally distributed exam is 42 with a standard deviation of 12.1. Which socre would be expected to occur less than 5% of the time? 1) 25 2) 32 3) 60 4) 67 -I know the answer is 67, but i don't know why .. PLEASE help!

math
identify what is the 90 percent confidence interval for occupational prestige for respondents with only a bachelor's degree (N=750), given you have known their mean=52.74, standard deviation=12.67.

math
Use Chebyshev’s theorem to find what percent of the values will fall between 162 and 292 for a data set with a mean of 227 and standard deviation of 13.

statistics
For the following scores, find the (a) mean, (b) median, (c) sum of squared deviations, (d) variance, and (e) standard deviation: 1,112; 1,245; 1,361; 1,372; 1,472

statistics
cost of producing is 50 cents each and they sell for 1.25 each. demand for programs at each game is normally distributed with a mean of 2500 and standard deviation if 200. how many shouild be prodcued

statistics
assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 20. find the probability that a randomly selected adult has an IQ less than 20.

statistics
psychologist wants to interview subjects with IQ scores are normally distributed with mean of 100 and standard deviation of 15. find the score that separating the top of IQ frin the bottom 90%

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