Homework Help: statistics

Posted by tim on Monday, February 28, 2011 at 9:05pm.

Five percent of all items sold by a mail-order company are returned by customers for a refund. Find the probability that of two items sold during a given hour by this company both will be returned for a refund

statistics - PsyDAG, Tuesday, March 1, 2011 at 9:35pm
Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you.
statistics - Tim, Tuesday, March 22, 2011 at 11:08am
an average of 0.56 defects per 500 yards. Using the Poisson formula, find the probability that the number of defects in a given 500-yard piece of this fabric will be more than 3

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