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View Policies Show Attempt History Current Attempt in Progress Acredit card company monitors cardholder transaction habits to detect any unusual activity. Suppose that the dollar value of unusual activity for a customer in a month follows a normal distribution with mean $250 and variance $2400, Round your intermediate calculations and final answers to four decimal places (eg 987654), (a) What is the probability of $250 to $291 in unusual activity in a month? PE (b) What is the probability of more than $291 in unusual activity in a month? P= (c) Suppose that 10 customer accounts independently follow the same normal distribution. What is the probability that at least one of these customers exceeds $291 in unusual activity in a month? P= e Textbook and Media