Question
A and B constitute a random sample of size 2 from normal
population with the mean µ and variance α2, find the efficiency of (A+2B)/3Solution
The average age of a group of 25 persons is found to be 30 years. Later it is found that age of two of the persons is calculated as 32 and 60 ins...
Determine the value of a − b given that a + 3b = 18a and 3a + b = 30 .
The average expenditure of a man for the first 7 month is Rs.5000 and for the next 5 months is Rs.8000. If he saves 12000 in that year then find his ave...
Anita bought a refrigerator at a discount of 20% on MRP. She earned one-third the amount of her CP by renting it for 300 days. After that, she resells i...
There are 4 numbers – A, B, C & D. B is 25% more than A and D is equal to average of A & C. Ratio of A to C is 3 : 4 and C is 5 more than B. Find valu...
A number is such that when it is multiplied by 5, it gives another number which is as much above from 210 as the original number (itself) is below 210. ...
The average age of A and B is 18 years. If A is to be replaced by C, the average would be 17 years. The average age of C and A is 19 years. Find the age...
In a cricket match the captain of one of a team scored 23 runs more than the average runs scored by the remaining 9 batsmen of that team who batted in t...
If average of first 11 numbers is (n – 46) and the sum of remaining number is 1850. Find the value of ‘n’, if the average of 25 numbers is ‘n’...
