Running times for 400 meters are Normally distributed for young men between 18 and 30 years of age, with a mean of 93 seconds and a standard deviation of 6 seconds. Thus, 99.7% of running times are approximately between: a. 45 and 141 seconds. b. 62 and 124 seconds. c. 75 and 111 seconds. d. None of the answer options is correct.

Running times for 400 meters are Normally distributed for young men between 18 and 30 years of age, with a mean of 93 seconds and a standard deviation of 6 seconds. Thus, 99.7% of running times are approximately between: a. 45 and 141 seconds. b. 62 and 124 seconds. c. 75 and 111 seconds. d. None of the answer options is correct.

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 1GP

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Question

	a.	45 and 141 seconds.
	b.	62 and 124 seconds.
	c.	75 and 111 seconds.
	d.	None of the answer options is correct.

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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