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The following is the probability distribution of the number of phone calls received by an office between 8 am and 9 am on a day. x 1 2 3 4 5 p(x) .1 .2 .2 .4 .1 16. [2.2.1] The probability of at least 3 phone calls is (A) .5 (B) .2 (C) .3 (D) .7 (E) None of these 17. [2.2.2] The mean number of phone calls is (A) 3.2 (B) 3.5 (C) 11.6 (D) 1.36 (E) 1 18. [2.2.2] The variance of the number of phone calls is (A) 3.2 (B) 1.17 (C) 11.6 (D) 1.36 (E) None of these 19. [2.3.2] Suppose that 80% of all voters in a city support candidate A. Assume that 40 voters in the city are randomly selected, what is the expected number of voters that will support candidate A in such a group? (A) 8 (B) 20 (C) 32 (D) 30 (E) None of these
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