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.
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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
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Cheers,
Stan H.