Q 1. (2)The class marks of a distribution
are 105, 115, 125, 135, 145. Find class size and class limits.
Q 2. (2) The following observations have
been arranged in ascending order. If the median of the data is 63, find the
value of x.
29,
32, 48, 50, x, x + 2, 72, 78, 84, 95
Q 3. Find mean & mode of the following data:
|
Marks
|
10
|
20
|
30
|
40
|
50
|
60
|
70
|
|
Number
of students
|
7
|
9
|
10
|
18
|
22
|
16
|
8
|
Q 4. (3)If mean of observations is 9, find mean of last 3
observations.
Q 5. (3)The mean of a data is 64. Find the new mean
if each of the observation of a data is
(a) increased by 2 (b) decreased by 3 (c)
multiplied by 0.25
Q 6. (4) Draw a histogram for marks of students
given below:
Marks 0 – 10 10
– 30 30 – 45 45 – 50 50
– 60
No
of students 8 32 18 10 6
Q 7. (4)Construct a frequency polygon for
following data without using histogram:
Income (in Rs) No. of workers
60 – 90 12
90 – 120 14
120 – 150 18
150 – 180 10
180 – 210 9
210 – 240 4
Q 8. (4)If mean of the following data is
20.6 and and total observation is 50 , find missing frequencies:
x 10 15 20 25 35
f 3 f1 25 f2 5
Q 9. (4) The marks obtained by 40 students
of class IX are
18, 8, 12, 6, 8, 16, 12, 5, 23,
2, 10, 20, 12, 9, 7, 6, 5, 3, 5, 13, 21, 13, 15, 20, 24, 1, 7, 21, 16, 13, 18,
23, 7, 3, 18, 17, 16, 16, 23, 2.
(i)
Construct
a frequency distribution table with one class being 15 – 20.
(ii)
Also
construct a cumulative frequency distribution of more than type. )
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