Reference no: EM13493376

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.