In an experiment, the average mark was 76.5 and the standard deviation 9.5.If 15% of the class scored grade A and the marks were assumed to follow a normal distribution. What is the lowest possible grade A and the highest possible grade B mark

In an experiment, the average mark was 76.5 and the standard deviation 9.5.If 15% of the class scored grade A and the marks were assumed to follow a normal distribution. What is the lowest possible grade A and the highest possible grade B mark

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

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.5: Comparing Sets Of Data

Problem 13PPS

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Question

In an experiment, the average mark was 76.5 and the standard deviation 9.5.If 15% of the class
scored grade A and the marks were assumed to follow a normal distribution. What is the lowest
possible grade A and the highest possible grade B mark

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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