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December 18, 2014

Homework Help: statistics

Posted by Probability on Tuesday, February 15, 2011 at 8:56pm.

A charity believes that when it puts out an appeal for charitable donations the donations it receives will normally distributed with a mean of $50 and standard deviation of $6, and it is assumed that donations will be independent of each other. (i) Find the probability that a sample mean of 5 donations will be smaller than $55. (ii) Find probability that the first donation is at least $3 more than second.

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