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If M is the mean of the first 100 even natural numbers, then what is the mean of the first 100 odd natural numbers?
CDS II 2022
M - 1
M
M + 1
M + 2
Mean marks of 50 students were found to be 78.4. But later it was detected that 95 was misread as 59 and 25 was misread as 52. What is the difference between correct mean and incorréct mean ?
CDS II 2022
0.04
0.08
0.12
0.18
If the average of m numbers is n*n and that of n numbers is m*m , then the average of m+n numbers is
66th BPSC
n/m
m/n
mn
None of the above
The average age of 4 sisters is 7 years. If we add the age of mother, then the average increases by 6 years. Find the age of the mother.
64th BPSC
37 years
47 years
57 years
None of the above
The combined age of a man and his wife is 6 times the combined age of their children. Two years ago their combined age was 10 times the combined age of their children; and six years later their combined age will be 3 times the combined age of their children. How many children do they have if each child is at least 2 years old?
CDS II 2023
2
3
4
1
The mean of p, q, r, s and t is 280. If the mean of p, r and t is 240, what is the mean of q and s?
