Suppose that water usages in American showers are normally distributed, with an average shower using 17.1 gallons, and a standard deviation of 3.5 gallons. Estimate the percentage of showers that used (a) between 6.6 and 27.6 gallons. __________% (b) more than 27.6 gallons. __________ % (c) less than 13.6 gallons. __________% (d) between 13.6 and 27.6 gallons. __________%

Suppose that water usages in American showers are normally distributed, with an average shower using 17.1 gallons, and a standard deviation of 3.5 gallons. Estimate the percentage of showers that used (a) between 6.6 and 27.6 gallons. % (b) more than 27.6 gallons. % (c) less than 13.6 gallons. % (d) between 13.6 and 27.6 gallons. %

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

Suppose that water usages in American showers are normally distributed, with an average shower using 17.1 gallons, and a standard deviation of 3.5 gallons. Estimate the percentage of showers that used

(a) between 6.6 and 27.6 gallons.

__________%

(b) more than 27.6 gallons.

__________ %

(c) less than 13.6 gallons.

__________%

(d) between 13.6 and 27.6 gallons.

__________%

Answer the blanks.

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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