Mathematics, 13.03.2020 00:31 embersongracie

From looking at previous cell phone bills, a student notes that her calls per month follow an approximately normal distribution with a mean of 172 minutes and a standard deviation of 26 minutes.

a) Sketch a graph of the density function, indicating the values for the mean and standard deviation. (You do not need to determine the values of f(x) for the yaxis.)
b) The student is considering using a calling plan that allows 200 minutes per month free. Assuming the distribution from part (a) continues, what is the probability that the student will exceed 200 minutes in a month?

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From looking at previous cell phone bills, a student notes that her calls per month follow an approx...