- #1

- 370

- 0

**Statistics Question - Normal Distribution SOLVED**

## Homework Statement

Hey, the question is shown in the attached document.

## Homework Equations

Mean = 79 Standard Deviation = 12

## The Attempt at a Solution

I dispise these questions, and i'm failing to grasp them at all.

I've done the first two parts fine, but it's part c i'm struggling on.

I've tried using the z function getting me to;

P (Z [tex]\leq[/tex] [tex]\frac{b}{12}[/tex] ) - P ( Z [tex]\leq[/tex] [tex]\frac{-a}{12}[/tex] ) = 0.375

But i've got no idea what i'm doing :/ this question has totally thrown me, all of the methods i've used replacing the 2nd equation into the first have given me useless answers, I can usually do these questions fine, but i'm struggling here, any help would be great!

#### Attachments

Last edited: