Answer to Question #199020 in Statistics and Probability for Nini

Question #199020

 If a sample of 25 canned goods is selected, what is the probability that the mean of the sample will be larger than 20 mg?


1
Expert's answer
2021-06-24T17:38:07-0400

Let XX be the mean sample: XN(μ=25,σ2=152)X\sim N\left(\mu =25,\:\sigma ^2=15^2\right) Then,

Z=xμσN(0,1)Z=\frac{x-\mu }{\sigma }\sim \:N\left(0,1\right)


The probability that the mean of the sample will be larger than 20mg is:

XN(μ=25,σ2=152)X\sim N\left(\mu =25,\:\sigma ^2=15^2\right)

=1P(Z252015)1P(Z0.3333)=1-P\left(Z\le \frac{25-20}{15}\right)\approx 1-P\left(Z\le 0.3333\right)

0.3694\approx 0.3694


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