Answered: A philosophy professor assigns letter…

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.3: Measures Of Spread

Problem 23PFA

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Question

A philosophy professor assigns letter grades on a test according to the following scheme.

A: Top 12%12% of scores

B: Scores below the top 12%12% and above the bottom 58%58%

C: Scores below the top 42% and above the bottom 25%

D: Scores below the top 75% and above the bottom 8%

F: Bottom 8% of scores

Scores on the test are normally distributed with a mean of 78.9 and a standard deviation of 9.3 Find the minimum score required for an A grade. Round your answer to the nearest whole number, if necessary.

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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