The standard deviation of the...

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Statistics

In a population of 240 women,the heights of the women are normally distributed with a mean of 64.2 inches and a standard deviation of 3.2 inches. If 36 women are selected at random, find the mean mu x and stand deviation sigma x of the population of sample means. Assume that ...

Statistics

Information from the American Institute of Insurance indicates the mean amount of life insurance per household in the United States is \$120,000. This distribution follows the normal distribution with a standard deviation of \$38,000. (A) If we select a random sample of 58 ...

statistics

According to U.S. News & World Report data, in 1995 tuition costs at Indiana University, a public university, were \$2,984 per year, while the tuition costs at the University of Evansville, a private university in Indiana, were \$11,800 per year. In that same year the average ...

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

Some IQ scores are standardized with a mean of 100 and a standard deviation of 16. Using the 68-95-99.7 Rule, Determine: What percent of people would have an IQ score 68 and 84.

math

Instant dinner comes in packages with weights that are normally distributed with a standard deviation of 0.3 oz. If 2.3 percent of the dinners weigh more than 13.5 oz, what is the mean weight?

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

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?