Question

I only need help on Question 31 Part A thats it.

Answer 1

Step 1

Given;

Step 2

Find the z-score

`\begin{gathered} z=(x-\mu)/(\sigma) \\ z=(308-268)/(15) \end{gathered}`
`z=(8)/(3)`

Find the probability associated with the z-score;

`P=0.996169619432`

The required probability will be;

`\begin{gathered} 1-0.996169619432 \\ =0.00384 \end{gathered}`

Answer;

`0.00384`

This suggests that the chance of the pregnancy lasting 308 days or longer is very little.