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Statistics 211 _ Examz 3 b Nam: - . ‘ ' ‘ \Om a
Summer 96 Smidt i \pgase prmt _
l 1. For the following numerical variables, state whether each 1s discrete or continuous. (8) 2 13%
Q» a. The time required to complete a phone call to a prospective client.
; b. The number of calls to the client. 0 c. The number of articles purchased by the client. I d The shipping weight of the articles. a. The number of successful surgeries, of all type 5. among the next ten performed at General Hospital.
=2; b. The number of doubles in twenty rolls of two dice.
i c. The number of spades in ﬁve cards taken without replacement ﬂom a well shufﬂed deck. d The number of classes a Cal Poly student drops before graduating. :. \ Indicate whether each of the following are binomial(B) or non-binomial(N) random variables. (8) 3. Many manufacturers have quality control programs that include inspection of incomm materials for
defects. Suppose that a computer manufacturer receives computer boardslig lots of ﬂy .Two boards are .1. mwmuuw— V. CW) r" Us if g A \ Q :‘r The table below contain the probability distribution for x = the number of potential suicide calls received
per day by a crisis intervention hotline. a.
b. Calculate the mean and the variance of x. (10) ‘ y
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