Question 449994
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Hi,
Trust You were thinking along these lines.
 6.  There is NO #4 section to be included in the sample space
 7. P(4 days with a correct prediction)=  .85*.85*.85*.85 = .5220 = ~ 52%
 8.  13 marbles in all(6-p,7-w): 2 drawn w/o replacemet: P(w,p) = 7/13*6/12
 9.   7! = 5040  7*6*5*4*3*2*1 (each selection has one less book as a possibility)
10.  5 students chosen from a class of 25 students: 25C5,order does not matter
11. P = 396/2800 = .141 or 14.1% (to the nearest tenth)
12.sample is not a random sample from the US population to be studied
13. (30/200) * 17000 = 2550
14. (25/330)*57000 =  ~ 4,318