Question

The percentage of the marks obtained by a student in the monthly test are given below:

Find the probability that a student gets more than 70% marks.

Answer 1

Hint: Try to figure out the number of favourable cases and number of total cases. Also, use probability is nothing but the ratio. Which is the number of favourable cases is the number of total cases.

Given that, the total number of unit tests are 5. Also, the number of subjects in which students cross 70% marks are 3. We know that probability is nothing but the ratio. Which is the number of favourable cases is the number of total cases.

According to the question, the probability that a student gets more than 70% marks $ = \dfrac{{{\text{No}}{\text{. of test in which the student scored more than 70% marks}}}}{{{\text{total number of tests}}}}$ which is equal to $\dfrac{3}{5} = 0.6$.
Hence, the probability that a student gets more than 70% marks is 60%.

Note: Probability is all about ratios starting from 0 and ends from 1. If our favourable cases are high then we are likely to win. And not then we'll tend to lose.