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# GHA 4 - STT200 Section Graded HA 4 Name Summer B 2008...

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STT200 Section________  Graded HA # 4     Name_______________________, Summer  B, 2008   Please write or mark the section number (-1 pt. if missing) Number of points for each problem is in brackets [ ]. SHOW YOUR WORK !   1) 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. [2] How many e-mails should the professor expect to receive each day? …………………………….. b. [2] What is the standard deviation? ……………………………………………………………………… c. [2] 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? ………………………………….. 2) The American Veterinary Association claims that the annual cost of medical care for dogs averages \$100 with a standard deviation of \$30, and for cats averages \$120 with a standard deviation of \$35. a. [3] Find the expected value for the annual cost of medical care for a person who has one dog and one cat.

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