SOLUTION: Please Help:)
It is known that 28% of American adults claim to be able to play a musical instrument. If twelve American adults are selected at random, what is the probability th
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It is known that 28% of American adults claim to be able to play a musical instrument. If twelve American adults are selected at random, what is the probability th
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Question 359703: Please Help:)
It is known that 28% of American adults claim to be able to play a musical instrument. If twelve American adults are selected at random, what is the probability that:
a. none of them plays an instrument?
b.fewer than five of them play an instrument?
c.more than five of them play an instrument?
d.more than half of them do not play an instrument?
Thank you Answer by edjones(8007) (Show Source):
You can put this solution on YOUR website! a)
1-.28=.72 don't play.
.72^12=.0194
.
b)
expand (x+y)^12
x^12+12x^11y+66x^10y^2+220x^9y^3+495x^8y4 |x=.72 y=.28
=.7746
.
c)
1-.7746=.2254
.
I'll leave d up to you.
.
Ed
