Question

The owner of an academic book shop keeps a record of the number of books he sells in each subject. He noted that in a particular month, he sold 50 math books, 120 science books, 70 social studies books and 60 language books. What is the probability that the next book sold is a science book?

Answer 1

Total number of books sold = 50 + 120 + 70 + 60 = 300
Probability that the next book sold is a Science book = $\frac{120}{300}$ = 0.4