Question Pool Statistics

# Statistics - SAMAGRA Question Pool & Answers | Class 9 English Medium

Kerala Syllabus SAMAGRA SCERT SAMAGRA Question Pool for Class 9 English Medium Maths Statistics

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

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Qn 2.

The mean of five quantities is 40 and two of them are 26 and 24.

a) find the sum of the others three quantities.

b) Find three numbers which can be the three quantities.

a) 5x40 --------- (26+24)

200 ---50

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Qn 3.

The energy club members of a school conducted a survey about the consumption of electricity in the houses of a locality. The details are shown in the following table.

 Consumption (Unit) No of Students 100-120 120-140 140-160 160-180 180-200 200-220 2 3 5 5 4 1

a) Find the total no: of Children?

b) Find the mean consumption of electricity.

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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

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Qn 5.

The following table shows the no. of patients registered in a govt. Hospital during the month of June

 No. of Patients No of days 100-150 150 – 200 200- 250 250 – 300 300- 350 350- 400 3 5 3 11 6 2

a) Find the no. of days having patients between 200 and 250.

b) Find the mean no: of patients in a day?

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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

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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?

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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?