What fraction score lies between 80 and 90, if the normal distribution mean is 70 and the standard deviation is 10? - Quora

Answer (1 of 3): Convert 80 and 90 to z-scores and look up the z-scores in the Normal Distribution table in the back of your textbook. You want the area between them, so you will need to subtract the area between z=0 and the z score you get from converting 80 to a z-score from the area between z=

A set of data has a normal distribution with a mean on 51 and a standard deviation of 7. What is the percent of data within the following interval: 30 - 72? - Quora

Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. What is the percentage of scores between 80 and 140?

If scores are normally distributed with a mean of 25 and a standard deviation of 7.5, what percent of the scores is: a.equal to 25; b. greater than 40; c. between 28 and 40? - Quora

Probability Cheat Sheet: Rules, Laws, Concepts, and Examples - StrataScratch

What fraction score lies between 80 and 90, if the normal distribution mean is 70 and the standard deviation is 10? - Quora

If a test is normally distributed with a mean of 90 and a standard deviation of 10, what proportion of the scores is above 110 and below 85? - Quora

Probability Cheat Sheet: Rules, Laws, Concepts, and Examples - StrataScratch

Students' scores in an exam have an average mark of 80 (on the 100 scale) with a standard deviation of 8. Answer this question: What is the z-score for a student who

On a test, mean score was 70 and the standard deviation of the scores was 15. If there were 1000 test takers, how many people scored between 60 and 75? - Quora

What fraction score lies between 80 and 90, if the normal distribution mean is 70 and the standard deviation is 10? - Quora

The average score of a statistics class was 71 with a standard deviation of 10. What is the Z-score of a student with a grade of 80? - Quora