Question: 18. The grades in a statistics examination has a Normal distribution with mean 65. 2.5 percent of the students who wrote this examination failed (i.e.

18. The grades in a statistics examination has a Normal distribution

18. The grades in a statistics examination has a Normal distribution with mean 65. 2.5 percent of the students who wrote this examination failed (i.e. had a score below 50). What is the standard deviation of the distribution of grades? (Hint: You can use 68-95-99.7.) A) 5 B ) 7.5 C) 10 D) 12.5 E 15

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