Qn 1.

The table shows the height of students in a class. The mean height is 145. How many students have height in between 150 and 160?

Height (cm)	No of Students
120-130 130-140 140-150 150-160 160-170	4 10 12 - 4

Qn 2.

Qn 3.

Qn 4.

Rajani copied a question for finding the mean of the marks of students in a class.

Marks	No of Students
0-10 10-20 20-30 30-40 40-50	4 6 7 10 3

She calculated the mean as 19. But later she identified that she had wrongly written 6 instead of 16 in second row.

a) What would be the total marks she obtained?

b) What is the actual no. of students in the class?

c) Calculate the actual mean

Qn 5.

Qn 6.

The following table shows the daily income of 25 families in a locality. Find the daily average income/

Daily Income (Rs)	No of families
200 250 300 425 500 550 625	2 6 7 3 4 2 1

 

Qn 7.

The following table shows the quantity of milk sold by a farmer in a month.

Quantity of Milk (Liters)	No of Days
10 11 12 13 14	7 3 10 6 4

a) Find the total quantity of milk sold?

b) Find the average quantity of milk sold in a day?

Qn 8.

The members of a club are classified according to their age

Age	No of Members
19-23 23-27 27-31 31-35 35-39 39-43	6 11 8 12 7 6

a) How many members are there in the club?

b) Find the mid value of each class?

c) calculate the mean Age?