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WorksheetsSTATISTICS IX
Total questions: 10
Worksheet time: 7mins
Name
Class
Date
1.
Let m be the midpoint and b be the upper limit of a class in a continuous frequency distribution. The lower limit of the class is
a)
2m-b
b)
2m+b
c)
m-b
d)
m-2b
e)
2.
The mean of a set of seven numbers is 81.If one of the numbers is discarded,the mean of the remaining numbers is 78.The value of discared number is
a)
101
b)
100
c)
99
d)
98
3.
A particular observation which occurs maximum number of times in a given data is called its
a)
Frequency
b)
range
c)
mode
d)
median
4.
For which set of numbers do the mean,median,and mode all have the same values?
a)
2,2,2,4
b)
1,3,3,3,5
c)
1,1,2,5,6
d)
1,1,2,1,5
5.
The algebraic sum of the deviations of a set of n values from their mean is
a)
0
b)
n-1
c)
n
d)
n+1
6.
The mean of five observations x,x+2,x+4,x+6,x+8 is 11, then the mean of first three observations is
a)
9
b)
11
c)
13
d)
15
7.
If the mean of 5,9,x,17 and 21 is 13, then the valus of x is
a)
9
b)
13
c)
17
d)
21
8.
The mean of a,b,c,d,and e is 28.If the mean of a,c,and e is 24,the mean of b and d is_____
a)
24
b)
36
c)
26
d)
34
9.
The mean of the square of first 11 natural numbers is
a)
26
b)
46
c)
48
d)
52
10.
The mean of a set numbers is A.If each number is multiplied by z,the mean is
a)
A+z
b)
A-z
c)
zA
d)
A
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