# AS Maths, S1 NORMAL DISTRIBUTION

A revision page on how to identify and answer a normal distribution question

- Created by: Louis Gower
- Created on: 22-04-09 20:12

First 160 words of the document:

Normal Distribution

How to spot a ND question:

It contains the word `normal' or `normally'

It contains the word `distribution' or `distributed'

How to go about a ND question:

1. Form the question in terms of X

2. Form a short notation in P

3. Standardise the equation so that it is in terms of Z including the

information you have been given

4. Draw a normal distribution curve

5. Rearrange the graph if reading is problematic

6. Read from the table

7. Underline final answer

Example ND Question:

The heights of a group of athletes are modelled by a normal distribution with mean 180cm and a standard

deviation 5.2cm. The weights of this group of athletes are modelled by a normal distribution with mean

85kg and standard deviation 7.1kg.

Find the probability that a randomly chosen athlete

(a) is taller than 188cm

(4)

Answer:

10.9382=0.0618

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