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Five percent of all items sold by mail-order company are returned by customers for a refund.
Find the probability (and show the tree diagram) that two of the items sold 
by this company
a. Both will be returned for a refund
b. Neither will be returned for a refund
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(a) P = 0.05*0.05 = 0.0025. ANSWER
Returning two items are two independent events with the probability
of 0.05 each. Therefore, we multiply the probabilities.
(b) P = (1-0.05)*(1-0.05) = 0.95*0.95 = 0.9025. ANSWER
Non-returning two items are two independent events with the probability
of 1-0.05 = 0.95 each. Therefore, we multiply the probabilities.
Solved (with explanations).
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The words crossed out in the condition should not appear in the description of this problem.
In Math problems, extra words in their formulations are just as bad as missed words.
All required words must be present; redundant words should not appear, at all.
