Answered: Weekly food expenditures for families…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Question

Weekly food expenditures for families of four in a large city average R420 with a standard deviation of R80. Assuming the weekly food expenditures are normally distributed.

a) Find the interval of weekly food expenditures that will include 99.7% of the families of four (rounded off to zero decimals).

b) What percentage of these weekly food expenditures are between R260 and R500 (rounded off to one decimal)?

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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