Eco249Answers8-11.doc
8.9 f(x) = 110 < x < 175. a. P(X > 150) ... For Exercises 8.11 to 8.14 we calculate
probabilities by determining the area in a triangle. That is, .... P(Z < .71) ? P(0 < Z
< ?.24) = .7611 ? .4052 = .3559. c P(X < 3) ... 8.67 From Exercise 7.57: = 65, = 21,
and = 4.58 ...... There is not enough evidence to infer that the site is acceptable.