SOLUTION: a survey of high school seniors of a graduating high school seniors, 10% said that their generation will be remembered for their social concerns, of seven graduating seniors are se

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Question 592084: a survey of high school seniors of a graduating high school seniors, 10% said that their generation will be remembered for their social concerns, of seven graduating seniors are selected at random. find the probability that either two or three will agree with that statement.
P= .10
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
y agree and x disagree
x=.1 and y=.9
(x+y)^7 This is a binomial expansion.
7C2*x^2y^5 + 7C3*x^3y^4
=21*.01*.5905 + 35*.001*.6561
=.1240+.0230
=.1570
1-.1570=.843 the probability that either two or three will agree with the statement that their generation will be remembered for their social concerns.
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I did this backwards because the question was confusing but the answer is correct.
.
Ed