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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
55.   From past experience, a professor knows that the test score of a student taking her final examination is a random variable with mean 75.
(a)     Give an upper bound to the probability that a student’s test score will exceed 85.
Suppose in addition the professor knows that the variance of a student’s test score is equal to 25.
(b)     What can be said about the probability that a student will score between   65 and 85?
(c)Â Â Â Â Â How many students would have to take the examination so as to ensure, with probability at least .9, that the class average would be within 5 of 75?
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