Suppose exam scores on the first Chemistry test at a large university are normally distributed with a mean of 73 and standard deviation of 10.5.(a) What percentage of students scored above 80?(b) Find the probability that a group of 10 students selected at random will have an average test score above 70.

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Answered: Suppose exam scores on the first…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

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Suppose exam scores on the first Chemistry test at a large university are normally distributed with a mean of 73 and standard deviation of 10.5.

1. (a) What percentage of students scored above 80?
2. (b) Find the probability that a group of 10 students selected at random will have an average test score above 70.

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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