Midterm review - normal and sampling distributions

Midterm review - normal and sampling distributions -...

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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,
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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.

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Midterm review - normal and sampling distributions -...

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