Statistics board Questions (Mean) #statisticsclass10

#statisticsclass10
STATISTICS chapter 14 class x, ncert cbsc exam
Statistics board Questions (Mean)
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Find the mean of the following data:
Class
Frequency
less than 20
15
less than 40
37
less than 60
74
less than 80
99
less than 100
120
The mean of the frequenciey distribution is 53. But the frequencies f1 and f2 in the classes 20-40 and 60- 80 are missing. Find the missing frequencies.
1 point
Classes
Frequencies
0-20
15
20-40
f1
40-60
21
60-80
f2
80-100
17
Total
100
Your answer
1 point
The mean of the following data is 18.75. Find the value of P:
Class marks (x)
Frequency (f)
10
5
5
10
P
7
25
8
30
2

The frequency distribution table of the agricultural holdings in the village is given below. Find the mean are held by a family.
1 point
Area (in hectares)
No. of families
1-3
25
4-6
22
7-9
52
10-12
45
13-15
16
Your answer
The average score of boys in the examination of a school is 71 and that of the girls is 73. The average score of the school in the examination is 71.8. Find the ratio of number of boys to the number of girls who appeared in the examination. (2015)