If scores are normally distributed with a mean of u = 78 and a standard deviation of o = 5, what proportion of scores are between the values of 68 and 78? 0.4772 0.9643 0.2912 0.0864

Scores on an IQ test are normally distributed with a mean of 50 and a standard deviation of 20. What is the IQR of the IQ score?

The difference in the population means divided by the population standard deviation of a study is the blank?

Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation 20. Find Upper P 4 which is the IQ score separating the bottom 44​% from the top 96​%.

Suppose the exam average in a class is 55% with a standard deviation of 4. What proportion of students scored above 57%? Round to two places.

Scores on an IQ test are normally distributed with a mean of 100 and a standard deviation 15. what is the IQR of the IQ score?

A standardized memory test has a mean of μ = 100 and a standard deviation of σ= 10. What percent of individuals would score between 89 and 115?

What is the z-score of x = 75, if it is 2.8 standard deviations to the left of the mean? Answer to the nearest tenth.

Suppose that the distance of fly balls hit to the outfield (in baseball) is normally distributed with a mean of 250 feet and a standard deviation of 44 feet. Let X = distance in feet for a fly ball. Find the 80th percentile of the distribution of fly balls. (Round your answer to one decimal place.)

Suppose that the scores on a reading ability test are normally distributed with a mean of 65 and a standard deviation of 9. what proportion of individuals score at most 52 points on this test? Round your answer to at least four decimal places. ?