Mathematics, 06.11.2019 02:31 alexandrecarmene

From past results, a professor knows that the test score of a student taking her final examination is a random variable with mean 65 and a variance known to be 15. what is the probability that a student will score between 50 and 80? (7-8.1.2)

(a) somewhere between 0.75 and 0.85
(b) exactly 0.6826
(c) exactly 0.9333
(d) somewhere between 0.55 and 0.75

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From past results, a professor knows that the test score of a student taking her final examination i...