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Average Objective questions and answer

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1.) Find the average of all prime numbers between 30 and 50?

A. 26.25                  B. 39.8

C. 37.75                 D. None of these

View Answer

Answer: Option B

Explanation

There are five prime numbers between 30 and 50.

They are 31,37,41,43 and 47.

Therefore the required average= (31+37+41+43+47)/5

==> 199/5 ==> 39.8.


2.) Find the average of first 40 natural numbers?

A. 27.5                     B. 19.8

C. 20.05                   D. None of these

View Answer

Answer: Option C

Explanation

Sum of first n natural numbers=n (n+1)/2;

So, Sum of 40 natural numbers= (40*41)/2 ==> 820.

Therefore the required average= (820/40) ==> 20.5.


3.) Find the average of first 20 multiples of 7?

A. 22.66                B. 73.5

C. 37.75                D. None of these

View Answer

Answer: Option B

Explanation

Required average =7(1+2+3+……. +20)/20

==> (7*20*21)/ (20*2)

==> (147/2)=73.5.


4.) The average of four consecutive even numbers is 27. find the largest of these numbers?

A. 19                         B. 27

C. 30                        D. None of these

View Answer

Answer: Option C

Explanation

Let the numbers be x, x+2, x+4 andx+6. Then,

(x+(x+2)+(x+4)+(x+6))/4) = 27

==> (4x+12)/4 = 27

==> x+3=27  à x=24.

Therefore the largest number=(x+6) =24+6=30.


5.) There are two sections A and B of a class consisting of 36 and 44 students respectively. If the average weight of section A is 40kg and that of section B is 35kg, find the average weight of the whole class?

A. 22.66 kg                  B. 73.5 kg

C. 37.25 kg                  D. None of these

View Answer

Answer: Option C

Explanation

Total weight of(36+44) students=(36*40+44*35)kg  =2980kg.

Therefore weight of the total class=(2980/80)kg  = 37.25kg.


 

 
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