Question: 1. In statistics examination, the average grade was 85 and the standard deviation was 8. All students with grades from 88 to 94 received a

1. In statistics examination, the average grade was 85 and the standard deviation was 8. All students with grades from 88 to 94 received a grade of B. If the grades are approximately normally distributed and 10 students received a grade of B. How many students took the examination?

2. In a very large class in history, the final examination grades have a mean of 66.5 and standard deviation of 12.6. Assuming that it is reasonable to approximate the distribution of these grades with a normal distribution, what percentage of the grades should exceed 74? Assume that the grades are always whole numbers.

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