Answered: The number of mistakes made on a typing…

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section: Chapter Questions

Problem 8CR

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Question

The number of mistakes made on a typing test is Normally distributed. Five office employees---Kelly, Meredith, Stanley, Oscar, and Toby---each take this typing test and record the number of mistakes they make. In the table below, the corresponding zz-score is given for each individual. Based on this information, which worker made the least mistakes on the typed test and therefore performed best?

z scores

kelly 2.2

mary -0.4

stanley -1.8

oscar 1.0

toby 0

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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