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 normal score distribution has a mean amount of 56 and a standard deviation of 4. What percentage of score lies between 52 and 60? - Quora

If a normal distribution has a mean of 65 and a standard deviation of 8, what score bounds the 19.8% below the mean? - Quora

SOLVED: Suppose a class of students has a mean score of 80 and SD = 10 on a statistics test. Assume scores are normally distributed. Using the normal curve, approximate percentages of

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If students test scores are normally distributed (mean 75 and standard deviation 15), what is the probability that a randomly selected group of 10 students will have a mean score greater than 80? - Quora

The mean mark on a math exam was 70%, with a standard deviation of 10%. If 200 students wrote the exam, how many would be expected to score between 60% and 80%? - Quora

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

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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

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