Question: A large lecture class has 280 students. The professor announced that the mean score on an test is 74 with a standard deviation of 8.

A large lecture class has 280 students. The professor announced that the mean score on an test is 74 with a standard deviation of 8. (a) At least how many students score within 58 and 90? (b) Assume that the distribution of marks is symmetric and bell shaped. Approximately how many students scored within 58 and 90? (c) Assume that the distribution of marks is symmetric and bell shaped. Approximately how many students scored above 90?

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