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mariarad [96]
3 years ago
13

5. In a bag of 30 cookies, there are 12 chocolate chip, 4 double chocolate chip, 5 peanut butter, 3 sugar, and 6 mint chocolate

cookies. If Sarah reaches in and takes a 2 cookies and eats them, what is the probability of her picking a chocolate chip cookie and then a peanut butter cookie? Are these events independent or dependent?
2/29
60/ 870
3/6
12/16
Mathematics
2 answers:
OverLord2011 [107]3 years ago
8 0

Do you have the answer?

Vikki [24]3 years ago
6 0

Answer:  The correct option is

(A) \dfrac{2}{29}.

Step-by-step explanation:  Given that in a bag of 30 cookies, there are 12 chocolate chip, 4 double chocolate chip, 5 peanut butter, 3 sugar, and 6 mint chocolate cookies.

Sarah reaches in and takes a 2 cookies and eats them.

We are to find the probability that she picked a chocolate chip cookie and then a peanut butter cookie. Also, to check whether these events are independent or dependent.

Let A denotes the event that Sarah picks a chocolate chip cookie and B denotes the event that Sarah picks a peanut butter cookie.

So, the probabilities of events A and B are

P(A)=\dfrac{^{12}C_1}{^{30}C_1}=\dfrac{12}{30}=\dfrac{2}{5},\\\\\\P(B)=\dfrac{^5C_1}{^{29}C_1}=\dfrac{5}{29}.

Since the number of total cookies is reduced by one after Sarah picked and ate chocolate chip cookie, so

event B is dependent on event A.

Therefore, the events are dependent and the probability that Sarah picked a chocolate chip cookie and then a peanut butter cookie is

P(A)\times P(B)=\dfrac{2}{5}\times\dfrac{5}{29}=\dfrac{2}{29}.

Thus, the required probability is \dfrac{2}{29} and the events are dependent.

Option (A) is CORRECT.

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