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=

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

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

Scores are normally distributed with a mean of 86 and a standard deviation of 14. What is the probability that a random student scored below 72? - 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

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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

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

The mean of a set of normally distributed test scores is 70 with a standard deviation of 8. What percent of the scores lie between 80 and 90? Answer to the nearest

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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

Can the scores for a mathematics course be normally distributed with a mean of 70 and a standard deviation of 8 if the instructor wishes? - 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