The duration of routine operations in a certain hospital has approximately a normal distribution with an average of 156 minutes and a standard deviation of 8 minutes. What percentage of operations last less than 160 minutes? Round your answer to one decimal place. 80.9% 69.1% 30.9% 38.2%

The duration of routine operations in a certain hospital has approximately a normal distribution with an average of 156 minutes and a standard deviation of 8 minutes. What percentage of operations last less than 160 minutes? Round your answer to one decimal place. 80.9% 69.1% 30.9% 38.2%

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

		80.9%
		69.1%
		30.9%
		38.2%

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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