MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Wild boar population weight has standard deviation of 50 lb.

a) Find the probability of existence of a random sample (size 100) weight within + 5 lb. of population mean weight.

b) For the same sample size, find the probability of the weight within + 10 lb. of population mean weight.

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a)

Wild boar population weight has standard deviation of 50 lb. That is, σ=50.

The probability of existence of a random sample (size 100) weight within ±5 lb. of population mean weight is,

P-5<x¯-μ<5=P-550100<x¯-μσn<550100=P-55<z<55=P-1<z<1=Pz<1-Pz<-1

The probability of z less than –1 can be obtained using the excel formula “=NORM.S.DIST(–1,TRUE)”. The probability value is 0.1587.

The probability of z less than 1 can be obtained using the excel formula “=NORM.S.DIST(1,TRUE)”. The probability value is 0.8413.

The required probability value is,

P-5<x¯-μ<5=Pz<1-Pz<-1=0.8413-0.1587=0.6826

Thus, the probability of existence of a random sample (size 100) weight within ±5 lb. of population mean weight is 0.6826.

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