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

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
RELATED QUESTIONS
It is known that 28% of American adults claim to be able to play a musical instrument.... (answered by robertb)

It is known that 28% of American adults claim to be able to play a musical instrument.... (answered by Manny Pacquiao)

This question was answered for me before but i didn't understand the answer at all. It (answered by solver91311)

I am trying to help my daughter with her homework and I am stuck....it has been sooooo... (answered by Earlsdon)

Suppose that you are designing an instrument panel for a large industrial machine. The... (answered by stanbon)

At Lincoln Middle School 63% of the students play a musical instrument, 45% play a sport, (answered by richard1234)

A study of 400 randomly selected American Airlines flights showed that 344 arrived on... (answered by cornball3440)

Suppose that you are designing an instrument panel for a large industrial machine. The... (answered by solver91311)

A recent Wall Street Journal article indicated that 38% of American teenagers use... (answered by Boreal)