91.
If the mean of 4 observations is 20, when a constant 'c' is added to each observation, the mean becomes 22. The value of c is :

92.
The average age of 30 students is 9 years. If the age of their teacher is included, the average age becomes 10 years. The age of the teacher (in years) is :

93.
The average age of 20 boys in a class is 12 years. 5 new boys are admitted to the class whose average age is 7 years. The average age of all the boys in the class becomes:

94.
The frequency distribution data is given below. If the average age is 17 years, the value of m is
Age (in years) : 8 20 26 29
No. of people : 3 2 m 1

95.
The average of six numbers is 3.95. The average of two of them is 3.4, while the average of the other two is 3.85. The average of the remaining two numbers is :

96.
If the arithmetic mean of 7, 5, 13, x and 9 is 10, then the value of x is :

97.
3 years age, the average age of a family of 5 members was 17 years. A baby having been born, the average age of the family is same today. The present age of the baby is :

98.
If the average of 5 consecutive integers is x then, find the average of next to next 5 consecutive integers.

99.
The average age of P, Q and R is 15 years more than R's age. If the total age of P and Q together is 39 years, then R's age is ?

100.
Find the average of 1.11, 0.01, 0.101, 0.001, 0.11 = ?

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