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question 4
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alejandro is a fisherman. his customers are 3 restaurants and 9 supermarkets. if one of them called to cancel an order, what are the chances the cancellation came from a restaurant?

a. $\frac{3}{9}$
b. $\frac{1}{4}$
c. none of these
d. 9
e. 3

Explanation:

Step1: Calculate total number of customers

Total customers = Number of restaurants + Number of supermarkets. So, \(3 + 9=12\) customers.

Step2: Calculate probability

Probability \(P=\frac{\text{Number of favorable outcomes}}{\text{Total number of outcomes}}\). Favorable outcomes (restaurant) \(n = 3\), total outcomes \(N=12\). So, \(P=\frac{3}{12}=\frac{1}{4}\)

Answer:

B. \(\frac{1}{4}\)