Answered: Electricity bills: According to a…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Related questions

Question

Electricity bills: According to a government energy agency, the mean monthly household electricity bill in the United States in

2011

was

$109.77

. Assume the amounts are normally distributed with standard deviation

$22.00

. Use Excel to answer the following. Round the answer to four decimal places.

Part: 0 / 3

0 of 3 Parts Complete

Part 1 of 3

(a) What proportion of bills are greater than

$137

The proportion of bills that are greater than

$137

is
.

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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