SOLUTION: Ten percent of adults say oatmeal raisin is their favorite cookie. You randomly select 12 adults and ask each to name his or her favorite cookie. Find the probability that the numb

Question 248207: Ten percent of adults say oatmeal raisin is their favorite cookie. You randomly select 12 adults and ask each to name his or her favorite cookie. Find the probability that the number who say oatmeal raisin is their favorite cookie is
a. Exactly four
b. At least four
c. Less than four
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Ten percent of adults say oatmeal raisin is their favorite cookie. You randomly select 12 adults and ask each to name his or her favorite cookie.
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Binomial: n=12 ; p=0.10 ; x varies
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Find the probability that the number who say oatmeal raisin is their favorite cookie is
a. Exactly four
P(x=4) = 12C4(0.10)^4(0.90)^8 = 0.0213
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b. At least four
P(4 <= x <= 12) = 1 - binomcdf(12,0.1,3) = 0.0256
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c. Less than four
P(0 <= x <= 3) = 0.9744
===========================
Cheers,
Stan H.

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