The times taken by 15-year-olds to solve a certain puzzle are normally distributed with mean and
Question:
The times taken by 15-year-olds to solve a certain puzzle are normally distributed with mean μ and standard deviation 7.42 minutes.
a. Find the value of μ, given that three-quarters of all 15-year-olds take over 20 minutes to solve the puzzle.
b. Calculate an estimate of the value of n, given that 250 children in a random sample of n 15-year-olds fail to solve the puzzle in less than 30 minutes.
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Step by Step Answer:
a To find the value of we can use the following formula 20 30 2 25 minute...View the full answer
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Related Book For 
Cambridge International AS & A Level Mathematics Probability & Statistics 1 Coursebook
ISBN: 9781108407304
1st Edition
Authors: Dean Chalmers, Julian Gilbey
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