The time taken by the milkman to deliver to the High Street is normally distributed with a
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The time taken by the milkman to deliver to the High Street is normally distributed with a mean of 12 minutes and a standard deviation of 2 minutes. He delivers milk every day. Estimate the number of days during the year when he takes
(a) longer than 17 minutes,
(b) less than ten minutes,
(c) between nine and 13 minutes.
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Related Book For 
A Concise Course In Advanced Level Statistics With Worked Examples
ISBN: 9780748754755
4th Edition
Authors: J. Crawshaw, J. Chambers
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