1) Find the average height of five students with heights 142,147,153,165,157 in cms?

a) 152
b) 152.2
c) 152.4
d) 152.8

Answer is 152.8

2) The average marks of girls in a class is 62.5. The average marksof 4 girls among them is 60.The average marks of remaining girls is 63,then what is the number of girls in the class?

a) 11
b) 10
c) 9

Answer is 10

3) The average price of 10 books is increased by 17 Rupees when one of them whose value is Rs.400 is replaced by a new book.What is the price of new book?

a) 570
b) 750
c) 600

Answer is 570

4) The average age of Mr and Mrs Sharma 4 years ago is 28 years .If the present average age of Mr and Mrs Sharma and their son is 22 years. What is the age of their son?

a) 2
b) 1
c) 4

Answer is 2