Question

Assume that blood pressure readings are normally distributed what the mean of 135 and a standard deviation of 4.8. If 35 people are randomly selected, find a probability that they’re mean blood pressure will be less than 137.

Answer 1

Step 1

Given;

`\begin{gathered} \mu=135 \\ \sigma=4.8 \\ X=137 \end{gathered}`

Step 2

State the z-score formula

`z=(x-\mu)/(\sigma)`

Find the z-score

`z=(137-135)/(4.8)`
`z=(5)/(12)`

Step 3

Find the probability based on the z-score