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April 21, 2014

Homework Help: Probability and statistics

Posted by Arun on Friday, March 2, 2012 at 3:23am.

5. The probabilities that the lifetime of a randomly chosen device is below average, average, above average are respectively 0.2, 0.5, and 0.3. The probability that the 3 randomly chosen devices lifetimes of 2 are above average and 1 below average equals

Choose one answer
a. 0.054
b. 0.018
c. 0.036
d. 0.012

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