A biology professor responds to some student questions by e-mail. The probability model
below describes the number of e-mails that the professor may receive from students
during a day.
a. How many e-mails should the professor expect to receive each day?
b. What is the standard deviation?
c. If it takes the professor an average of ten minutes to respond to each e-mail, how much
time should the professor expect to spend responding to student e-mails each day?
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