Mathematics, 29.10.2020 21:00 ayindejoy

Students taking a midterm exam had a mean score of 68, with a standard devia- tion of 6.2. Assume that the scores are normally distributed. Unusual events are any values outside of two standard deviations from the mean.
(1) Find the probability that a student had a score lower than 61.8. Is this an
unusual event? Explain.

(2) Find the probability that a student had a score between 55.6 and 68. Is this
an unusual event? Explain.

Answers: 1

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Students taking a midterm exam had a mean score of 68, with a standard devia- tion of 6.2. Assume t...