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Average- Aptitude Questions and Answers

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Among five people with monthly income of Rs. 14000, Rs. 25000, Rs. 15000, Rs. 18000 and Rs.49000, how many will have income less than the mean income of the five people?

A)

1


B)

2


C)

3


D)

4



Correct Answer :

3


Explanation :

Avrage value = (14000+25000+15000+18000+49000) / 5 = 24200

3 person has less income than mean income

The average of the marks obtained by three girls in a test was twice the average of the marks obtained by eight boys in that test. If the total marks obtained by all these examinees was 168, find the average marks each of the girls obtained ?

A)
25

B)
12

C)
24

D)
14


Correct Answer :

24


Explanation :

let avg marks of boys= X
number of boys = 8
sum of marks of boys =8X

as is given, avg marks of girls = 2X
number of girls =3
sum of marks of girls= 6X

Now, total sum of marks obtained = 168 = 8X+6X
X = 168/14 = 12

avg marks of girls = 2X =2*12 =24

The mean of 100 students marks was found to be 40. it was found later that a mark 53 was read as 83. the correct mean is?

A)
40.30

B)
40.70

C)
39.40

D)
39.70


Correct Answer :

39.70


Explanation :

As given, mean marks of 100 students = 40
mean = sum of observation / no of observations
Sum of marks = 100 * 40 = 4000
Given that one observation is misread as 53 instead of 83
Hence after replacement, correct sum of observations = 4000 - 83 + 53 = 3970
Correct mean =sum of new observation / no of observations = 3970/100 = 39.7

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