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crystalpearl188
14.04.2020 •
Mathematics
Based on data a coffee shop owner has collected, she believes that 12% of her customers will buy a cookie to go with their coffee and that these purchases are independent. One day as she’s getting ready to close, 6 customers enter the shop and she has only 2 cookies left. What is the probability that no more than 2 of these last 6 customers will want a cookie?
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Ответ:
Probability that no more than 2 of these last 6 customers will want a cookie is 0.974.
Step-by-step explanation:
We are given that Based on data a coffee shop owner has collected, she believes that 12% of her customers will buy a cookie to go with their coffee and that these purchases are independent.
One day as she’s getting ready to close, 6 customers enter the shop and she has only 2 cookies left.
The above situation can be represented through Binomial distribution;
where, n = number of trials (samples) taken = 6 customers
r = number of success = no more than 2
p = probability of success which in our question is % of
customers who will buy a cookie, i.e; 12%
LET X = Number of customers who will want a cookie
So, it means X ~ Binom(
)
Now, probability that no more than 2 of these last 6 customers will want a cookie is given by = P(X
2)
P(X
2) = P(X = 0) + P(X = 1) + P(X = 2)
=![\binom{6}{0}\times 0.12^{0} \times (1-0.12)^{6-0}+ \binom{6}{1}\times 0.12^{1} \times (1-0.12)^{6-1}+ \binom{6}{2}\times 0.12^{2} \times (1-0.12)^{6-2}](/tpl/images/0600/1025/046aa.png)
=![1 \times 1 \times 0.88^{6} +6 \times 0.12 \times 0.88^{5} +15 \times 0.12^{2} \times 0.88^{4}](/tpl/images/0600/1025/dd237.png)
= 0.974
Hence, the probability that no more than 2 of these last 6 customers will want a cookie is 0.974.
Ответ:
i think it is a
hope i am right
Step-by-step explanation: