Question

Following table shows the grades obtained by the students of four sections viz. A, B, C and D of class Tenth of Ram Manohar Boys School. Answer the following questions using the information provided.

	Grades
Sections	First	Second	Third
A	12	18	25
B	10	23	17
C	8	22	15
D	14	24	12

If a student of class tenth of the school is randomly selected, what are the chances that he either “belongs to section B and got first grade” or “belongs to section D and got third grade”?

1. 15.5%
2. 13.5%
3. 13%
4. 11%

Answer 1

Correct Answer - Option 4 : 11%

Given:

Total number of students in section A is 55.

Total number of students in section B is 50.

Total number of students in section C is 45.

Total number of students in section D is 50.

Calculation:

Total number of students in the school is,

⇒ 55 + 50 + 45 + 50

⇒ 200

Students belong to section B and got the first grade,

⇒ 10

Students belong to section D and got the third grade,

⇒ 12

Percent of students,

⇒ (10 + 12)/200 × 100

⇒ 22/200 × 100

⇒ 11

∴ The chances are 11%.