On a certain test, the mean is 100 with a standard deviation of 15. The results come very close to fitting a normal curve. Suppose this test is given to a very large group of people. Use rule to find the percentage of people whose scores are between 85 and 115.

Q: The mean score on a standardized test is 540 with a standard deviation of 55. What percent of…

A: Given mean= 540 Standard deviation=SD= 55 We have to find the z value of 625.

Q: College students, in general, have a mean of 60 and a standard deviation of 8 on a measure of…

A: Solution-: Let, X= The college students have loneliness scores  Given: We find,

Q: Suppose the population of IQ scores in the town or city where you live is bell-shaped, with a mean…

A: Solution-: Let, X= the population of IQ scores in the town Given: We find mean and standard…

Q: The mean marathon finishing time for men and women was 268 minutes and 280 minutes respectively.…

A: From the given information, The mean marathon finishing time for men and women was 268 minutes and…

Q: The scores on a standardized test are normally distributed with a mean of 105 and standard deviation…

A: Here, mean is 105 and standard deviation is 10.

Q: The class mean for the exam was 82 with a standard deviation of 6.  There are 37 students in the…

A: We have given that, Mean = 82 , standard deviation σ = 6  sample size n = 37   Standard error of the…

Q: A set of data has a normal distribution with a mean of 100 and a standard deviation of 15. Find the…

A: First we reduce the given normal distribution to the standard normal distribution using the formula…

Q: A normal distribution has a mean of 175 and a standard deviation of 38. What percent of observations…

A: Given that A Normal distribution has Mean (μ) = 175 Standard deviation (σ) = 38   We know that Z =…

Q: The scores on a standardized test are normally distributed with a mean of 80 and standard deviation…

A:

Q: Suppose that IQ scores have a bell shaped distribution with a mean of 101 and a standard deviation…

A: The IQ scores have a bell shaped distribution with a mean of 101 and a standard deviation of 17.

Q: The scores on a test are normally distributed with a mean of 110 and a standard deviation of 22.…

A: Let X be the random variable from Normal distribution with mean (μ) = 110 and standard deviation (σ)…

Q: uppose the distribution of heights of a group of 200 children is normal with a mean of 150…

A:

Q: Use Chebyshev's Theorem to find what percent of the values will fall between 120 and 150 for a data…

A: The percentage of observations that are within k std dev. of the mean is 100(1-1k2)%

Q: The scores on a standardized test are normally distributed with a mean of 90 and standard deviation…

A:

Q: A paper reported that for a group of 76 college students, the average number of responses changed…

A: The mean number of responses changed from correct answer to incorrect answer on a test The standard…

Q: standardized test has a pop. mean of 152 and a standard deviation of 16. Jenny's z score is -0.56…

A: Given that Jenny's z score= -0.56, Nicole's z score=1.13

Q: Suppose the exam average in a class is 82% with a standard deviation of 2. What proportion of…

A:

Q: It is possible to have a standard deviation of -1 for some data set? True or False

A: See the below solution

Q: The mean score in a test is normally distributed with mean 30 and standard deviation 10. What is…

A: Given :  Mean, μ = 30 standard deviation, σ = 10 x = 55

Q: An instructor in a large lecture class found, at the end of the semester, that the total point…

A: The provided information is:

Q: The data in a data set are normally distributed with a mean of 190 and a standard deviation of 30.…

A: ∗Mean μ=190    standard  deviation σ=30    X~N 190,30 we need to find,   PX<130+PX>250=P…

Q: A student will spend 15 hours average each week in class. If the standard deviation is 2 hours, what…

A: Given that mean=15 and standard deviation = 2 Let, X= number of hours spent by a student in the…

Q: The scores for a standardized test follow a normal distribution with a mean test score of x = 84,…

A:

Q: a Develop a point estimate of the proportion of adults aged 18-29 who use the Internet. Develop a…

A: As per our guidelines, we are allowed to answer first three sub-parts only. Thanks   Given : For…

Q: Assume that an intelligence test scores are distributed normallt with a mean of 100 and a standard…

A: Standard normal distribution: The standard normal distribution is a special case of normal…

Q: he scores on a standardized test are normally distributed with a mean of 120 and standard deviation…

A:

Q: Suppose that the score on a reading test are normally distributed within a mean of 70 and a standard…

A:

Q: Given a distribution with a mean of 117 and standard deviation of 42. find a value with a 7-score of…

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