Question

Grade $6$ students participated in the Physics test. The class teacher prepared the data of the test as shown below:


If the passing marks is $40$, then how many students have failed the test?

• A. $28$
• B. $19$
• C. $31$
• D. $7$

Answer 1

The correct option is C $31$

Given, the passing marks is $40$.
Hence the students in intervals $20-30$ and $30-40$ would have failed the test.

Observe the given data.
It can be inferred that the there are $12$ students whose marks lie in the range of $20-30$, i.e., $20\le \text{Marks}<30$.

Moreover, there are $19$ students whose marks lies in the range of $30-40$, i.e., $30\le \text{Marks}<40$.

Thus, the total number of students who scored less than $40$ marks are $12+19=31$.

Hence, option $\left(c\right)$ correct.