- #1

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## Homework Statement

I've attached the question.

## Homework Equations

μ=np and σ=√(np(1-p))

Im using the normal distribution function on my calculator to avoid using z tables

## The Attempt at a Solution

The mean I calculated it to be 160/4 = 40. standard deviation sqrt(160*1/4*3/4)=5.47723

The question is asking for at least 40(greater or equal to 40) that will choose biscuits but because this is a normal distribution it will be the same as greater than 40 so if I use an X value of 40 the probabilities should just equal 0.5000 right? however the answer is 0.5364