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1.
In late 2007, it was reported that 79% of U.S. adults owned a cell phone (data extracted from E.C. Baig, "Tips Help Navigate Tech-Buying Maze", USA Today, November 28, 200, p.5B). Suppose that by the end of 2009, that percentage was 85%. If a sample of 10 U.S. adults is selected, what is the probability that:
(a) P(X = 8)
(b) P(X ≥ 8)
(c) P(X ≤ 10)
(d) Provide a substantive answer to the question.
2.
Mean of 2.0 seconds and Standard Deviation of 0.5
(a) P(X < 2)
(b) P(1.5 < X < 2.5)
(c) P(X > 1.8)
(d) P(A < X) = 0.99. What is A?
3.
Mean of 1.005 and Standard Deviation of 0.10
(a) P( < 1.0) =
(b) P(0.95 < < 1.0)
(c) P(1.0 < < 1.05)
(d) P( < 0.95) or P( > 1.05)
(e) Type a substantive answer to the question.
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