100+ Average Questions and Answers for SSC Exams - 2

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Question: 6

The mean of 25 observations was found to be 78.4. But later on it was found that 96 was misread as 69. The correct mean is

(A) 76.54

(B) 78.4

(D) 81.32

View Answer

Ans: C

Correct sum = (78.4 × 25 + 96 – 69) = 1987.

∴ Correct mean = $${1987} / {25}$$ = 79.48.

Question: 7

The total marks obtained by a student in Physics, Chemistry and Mathematics together is 120 more than the marks obtained by him in Physics, and Mathematics together?

(A) 40

(B) 50

(D) 80

View Answer

Ans: C

P + C + M = C + 120 ⇒ P + M = 120.

∴ Required average = $${P + M} / {2}$$ = $${120} / {2}$$ = 60.

Question: 8

The monthly incomes of five persons are Rs.1132, Rs.1140, Rs.1144, Rs.1136 and Rs.1148 respectively. What is their arithmetic mean?

(A) Rs. 1100

(B) Rs. 1140

(D) Rs. 1186

View Answer

Ans: B

Arithmetic mean = Rs.$$({1132 + 1140 + 1144 + 1136 + 1148} / {5})$$

= Rs. $$({5700}/{5})$$ = Rs. 1140.

Question: 9

Find the average of all the numbers between 6 and 34 which are divisible by 5.

(A) 10

(B) 20

(D) 40

View Answer

Ans: B

Numbers between 6 and 34, which are divisible by 5 are 10, 15, 20, 25 and 30.

∴ Average of above numbers = $${10 + 15 + 20 + 25 + 30} /{5}$$ = $${100}/{5}$$ = 20.

Question: 10

Out of 10 teachers of a school, one teacher retires and in place of him a new teacher 25 years old joins. As a result of it average age of the teachers reduces by 3 years. Age of the retired teacher (in years) is

(A) 50

(B) 55

(D) 65

View Answer

Ans: B

Total number of teachers = 10.

Age of new teacher = 25 years.

Age of the retired teacher = (25 + 3 × 10) years = 55 years.

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100+ Average Questions and Answers for SSC Exams - 2

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