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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)?

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)?

MATLAB: An Introduction with Applications
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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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)?
Transcribed Image Text: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)?
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