The numbers of shirts sold in a week by the (C) world's largest menswear store are normally
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The numbers of shirts sold in a week by the (C) world's largest menswear store are normally distributed with a mean of 2080 and a standard deviation of 50. Estimate
(a) the probability that in a given week fewer than 2000 shirts are sold,
(b) the number of weeks in a year that between 2060 and 2130 shirts are sold,
(c) the interquartile range of the distribution,
(d) the least number' of shirts such that the probability that more than w are sold in a given week is less than 0.02.
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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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