Midterm review - normal and sampling distributions

# Midterm review - normal and sampling distributions -...

This preview shows pages 1–2. Sign up to view the full content.

Midterm Review – Normal and Sampling Distributions 1. Normal distribution (section 5-3) Researchers studying the effects of a new diet found that the weight loss over a one- month period by those on the diet was normally distributed with a mean of 3 kilograms and a standard deviation of 1 kilogram. Answers (a) What proportion of the dieters lost more than 4 kilograms? (1 mark) (b) What proportion of the dieters gained weight? (1 mark) (c) If a dieter is selected at random, what is the probability that the dieter lost at most 2.5 kilograms? (1 mark) 2. Normal distribution, sampling distribution for means (section 6-2) and the rules of probabilities The amount of time spent by Canadian teenagers playing sports per day is normally distributed with a mean of 4 hours and standard deviation of 1.25 hours. Answers (a) Find the probability that a randomly selected Canadian teenager plays sports for more than 5 hours per day (2 marks) (b) Find the probability that if four Canadian teenagers are randomly selected,

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 09/25/2010 for the course OMIS OMIS 1000 taught by Professor Alexandershoumarov during the Fall '09 term at York University.

### Page1 / 2

Midterm review - normal and sampling distributions -...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online