CBSE Important Questions

Mathmatics Class X

Q. 6. A survey regarding the heights ( in cm ) of 51 girls of class X of a school was conducted and the following data was obtained:

Height ( in cm ) Number of girls
Less than 140 4
Less than 145 11
Less than 150 29
Less than 155 40
Less than 160 46
Less than 165 51

Find the median height.

Q. 7. Following is the age distribution of a group of students. Draw the cumulative & frequency polygon, cumulative & frequency curve (less than type) and hence obtain the median value.

Age Frequency
5 – 6 40
6 – 7 56
7 – 8 60
8 – 9 66
9 – 10 84
10 – 11 96
11 – 12 92
12 – 13 80
13 – 14 64
14 – 15 44
15 – 16 22
16 – 17 22

 

Q. 8. Find the median marks from the following data:-

Marks 00 and above 10 and above 20 and above 30 and above 40 and above 50 and above 60 and above 70 and above 80 and above 90 and above 100 and above
Number of Students 80 77 72 65 55 43 28 16 10 08 00

 

Q. 9. Find the mean, median and mode of the following data:

Classes 4 − 8 8 − 12 12 − 16 16 − 20 20 − 24 24 − 28 28 − 32 32 − 36 Total
No. of students 2 12 15 25 18 12 13 3 100

 

Q. 10. The following frequency distribution gives the monthly consumption of electricity 68 consumer of a locality. Find the median, mean and mode of the data and compare them.

Monthly Consumption of electricit No. of Consumers
65 – 85 4
85 – 105 5
105 – 125 13
125 – 145 20
145 – 165 14
165 – 185 8
185 – 205 4
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