1. 72
24) 20/39 28
25) S = {hhh, hht, hth, thh, tth, tht, htt, ttt}
10%
a. P(tails exactly twice) = 3/8 b. P(heads at least once) = 7/8
12.5%
8.26%
26) 3.75%
720
P(placebo and improvement) = 46%
3/14
1/6, ½, 1/3
7/29
1/169, 1/52 12 60
13) S = {hhhh, httt, thtt, ttht, ttth, thth, htht, tthh, hhtt, thht, htth, thhh, hthh, hhth, hhht, tttt}
3276
34) 1/6, 11/18
P(exactly one head) = ¼
5/12
5/104
¼ b) ½ c) ¼ d)3/4 e)1/4
14/55
$3.25
1/55
1/18
4/55 78
3/110
(It is fine to simply write 13!)
20) 10 $5
64.3%
$0 (breaks even)
Dependent: outcome is based on previous event
Independent: outcome is not based on previous event