On a test given to 150 students, the mean grade was 74.2 with a standard deviation of 9.8. Assuming a normal distribution, estimate the number of $B$ grades (between 80 and 90).

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The Answer of On a test given to 150 students, the mean grade was 74.2 with a standard deviation of 9.8. Assuming a normal distribution, estimate the number of $B$ grades (between 80 and 90).

On a Test Given to 150 Students, the Mean Grade BBB

On a Test Given to 150 Students, the Mean Grade $B$