Answered: Electricity bills: According to a…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Related questions

Question

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

2011

was

$108.87

. Assume the amounts are normally distributed with standard deviation

$18.00

. 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

$134

The proportion of bills that are greater than

$134

Part: 1 / 3

1 of 3 Parts Complete

Part 2 of 3

(b) What proportion of bills are between

$83

and

$145

The proportion of bills that are between

$83

and

$145

Part: 2 / 3

2 of 3 Parts Complete

Part 3 of 3

$118

The probability that a randomly selected household had a monthly bill less than

$118

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.

Expert Solution