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Assume that, nationwide, 20% of grade-school students develop influenza. Consider a grade-school class of 25 students ( I changed 15 to 25).

A. Find the probability that exactly 6 students in this class develop influenza.

B. Find the probability that at least 8 students in this class develop influenza.

C. Find the mean and standard deviation of X, the number of students in class, who will develop influenza.

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