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What is the mean and the standard deviation

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Reference no: EM132361774

A. The composite scores in a statistics course have a normal distribution with a mean of 68 and a standard deviation of 8. If a teacher decides to give the top 10% of the students an A grade, what is the lowest grade needed for an A?

B. Suppose a multiple choice test has 20 questions with each question having 4 choices, only one of which is correct (that is 20%). Suppose an unprepared students writes the answers ech time randomly picking on of the 4 choices. what is the probability that the students will get.

1. exactly 4 answers correct?

2. all the answers incorrect?

3. At least 8 correct?

What is the mean and the standard deviation?

Reference no: EM132361774

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