CRE 2 - Number Replaced/Added/Removed | Arithmetic - Average
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The mean of 100 observations is 50. If one observation 50 is replaced by 40, find the resulting mean?
- (a)
50
- (b)
49.90
- (c)
70
- (d)
40
Solution
Discuss
ReportThe average of 100 numbers is 60. One observation 50 is removed and another number x is added such that the average increases by 1. Find x?
The average of 100 numbers is 60. One observation 80 is removed and another number x is added such that the average decreases by 0.5. Find x?
- (a)
50
- (b)
40
- (c)
30
- (d)
20
A batsman scored an average of 12 runs in 7 innings. He played one more innings and the average then became 14. How many runs did he score in the last innings?
- (a)
28
- (b)
14
- (c)
12
- (d)
7
The average of 6 values is 12. A number is removed and the average increases by 1. Find the number removed.
- (a)
7
- (b)
8
- (c)
5
- (d)
11
The average of 6 values is 12. A number is removed and the average decreases by 1. Find the number removed.
- (a)
7
- (b)
18
- (c)
13
- (d)
17
The average of 6 values is 12. A number is added and the average increases by 1. Find the number added.
The average of 6 values is 12. A number is added and the average decreases by 1. Find the number added.
The average monthly income of 6 employees is Rs. 310. After one of them receives an increment the average rises to Rs. 315. Find the amount of increment.
- (a)
Rs. 2
- (b)
Rs. 25
- (c)
Rs. 20
- (d)
Rs. 30
The average marks of 7 students is 42%. When a student joined this group, the average increases to 48%. The marks of the student who joined is
- (a)
85
- (b)
78
- (c)
94
- (d)
90
A batsman scored 135 runs in the 21st innings and thus his batting average increases by 2. Find the batting average for first 20 innings.
[Batting Average = Total Runs scored / Number of innings]