Average Questions

What is the average of all numbers between 8 and 74 which are divisible by 7?

The average of 10 numbers is X and one of the number is 38. If 38 is replaced with 19, then what will be the new average?

The mean of marks secured by 30 students in division-A of class X is 67, 55 students of division-B is 63 and that of 40 students of division-C is 61. What is the mean of marks of the students of three divisions of Class X?

If a+1a=2 then the vealue of a5+1a5 will be

The mean of 10 observations is 17. One more observation is included and the new mean becomes 16. The 11th observation is

The median of the numbers 14, 12, 12, 16, 13 and 18 is

Among three numbers, the first is twice the second and thrice the third. If the average of three numbers is 396, then what is the difference between the first and the third number?

The average of marks obtained by 100 candidates in a certain examination is 30. If the average marks of passed candidates is 35 and that of the failed candidates is 10, what is the number of candidates who passed the examination?