Thursday, 10 January 2019

Measure of dispersion Class 11 Test



Measure of dispersion
Class 11
Practice Questions




 Q 1 The number of goals scored by two teams in a football session were as under

No of goals scored
No of matches (Team A )
No of matches ( Team B)
0
15
20
1
10
10
2
7
5
3
5
4
4
3
2
5
2
1

Which team is more consistent

Q 2 Calculate standard deviation by step deviation method

Class Interval
Frequency
0-10
2
10-20
3
20-30
4
30-40
1

Q 3 Calculate quartile deviation and mean deviation from median

Class Interval
Frequency
0-5
4
5-10
7
10-15
8
15-20
2
20-25
6
25-30
3

Q 4 Calculate mean deviation from mean

X
5
8
11
12
14

Q 5 Calculate Quatile when QD=10 and coefficient of quartile deviation =0.5

Answers

Ans 1    σ of A =4.43
σ of B=6.48
C.V of A=63.29
C.V of B = 92.57

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Ans 2  = 9.165

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Ans 3 =Q 1=7.5
Q 3 = 21.25
Q.D = 6.87
Mean =12.5
Coef of mean deviation = 6.33

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Ans 4 Mean = 10

Mean deviation =2.8

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Ans 5 Q1 =10
Q3 = 30


  




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