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
Probability and statistics - Writeacher, Friday, March 2, 2012 at 7:54am
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Probability and statistics - Anonymous, Tuesday, March 13, 2012 at 1:39pm
Probability and statistics - Anonymous, Tuesday, May 29, 2012 at 5:26pm
Question 1 of 1:
Finding Standard Deviation
A simple random sample of FICO credit rating scores is listed below:
714 751 664 789 818 779 698 836 753 834 693 802
Find range, variance, and standard deviation.
As of this writing, the mean FICO score was reported to be 678. Based on these results, is a FICO score of 500 unusual? Why or why not?
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