Average- Mean, Median & Mode (Chapter-1): 110 Important MCQs for Indian Competitive Exam Prep

The arithmetic mean (average) of the first ten whole numbers is

The average of a set of numbers is 75. If each number is increased by 20 and then divided by 5, what will be the new average?

The average of 8 numbers is 25. If the average of the first 4 numbers is 20 and the average of the last 4 numbers is 30, what is the value of the fifth number?

The heights (in inches) of a group of individuals are as follows: 63, 68, 71, 69, 72, 70, 66, 75, 73, 68. What is the 80th percentile height in this data set?

A student finds the average of 10, 2 digits numbers. If the digits of one of the numbers interchanged, the average increases by 3.6. The difference between the digits of the 2 digits number is

The average of a dataset of 7 numbers is 50. If the average of the first 4 numbers is 45 and the average of the last 3 numbers is 55, what is the value of the seventh number?

The average expenditure of a man for the first five months Rs. 1200 and for the next seven months is Rs. 1300. If he saves Rs. 2900 in that years, his monthly average income is

a The average age of group of 20 girls is 15 years and that of another group of 25 boys it is 24 years. The average age of the two groups mixed together is :

The average of some natural numbers is 15. If 30 is added to the first number and 5 is subtracted from the last number the average becomes 17.5 then the number of natural numbers is:

The average of the first 100 positive integers is

The average of 8 numbers is 20. The average of first two numbers is 15.5 and that of the next three is 21.33. If the sixth number be less than the seventh and eighth numbers by 4 and 7 respectively, them the eighth number is

The average of all the odd integers between 2 an 22 is

Sachin Tendulkar has a certain average for 11 innings. In the 12th innings he scores 120 runs and thereby increases his average by 5 runs. His new average is :

B was born when A was 4 years 7 months old and C was born when B was 3 years 4 months old. When C was 5 years 2 months old, then
their average age was :

The scores of a group of students in a math test are as follows: 23, 35, 28, 33, 5, 12, 40, 25, 20, 18, 1, 16. What is the first quartile of the data?

Total weekly emoluments of the workers of a factory is Rs. 1534. Average weekly emolument of a worker is Rs. 118. The number of
workers in the factory is:

Out of 20 boys, 6 are each of 1 m 15 cm height, 8 are of 1 m 10 cm and rest of 1 m 12 cm. The average height of all of them is

The average of six numbers is 32. If each of first three numbers is increased by 2 and each of the remaining three numbers is decreased by 4, then the new average is?

The mean of 9 observation is 16. One more observation is included and the new mean becomes 17. The 10th observation is

The average of 7 consecutive even numbers is 18. What is the largest of these numbers?