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20. Favorite Cookie Ten percent of adults say oatmeal raisin is their favorite
cookie. You randomly select 12 adults and ask them to name their favorite
cookie. Find the probability that the number who say oatmeal raisin is their
favorite cookie is (a) exactly four, (b) at least four, and (c) less than four.
(Source: WEAREVER)

Respuesta :

jcherry99

Answer:

Step-by-step explanation:

A

exactly 4

There are 12 adults.

4 like oatmeal cookies the best.

P(exactly 4) = 4/12 = 1/3 = 0.3333...

B)

At least 4

4 5 6 7 8 9 10 11 12

So there are 9 choices (4 .. 12) of those who could like oatmeal cookies the best.

P(9) = 9/12 = 0.75

C)

1 2 3

There are at most 3 people who could like oatmeal cookies the best.

P(<4) = 3/12 = 0.25

Less than 4 who would choose oatmeal cookies = 1/4

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