Ncert- Maths – Statistics -Set A

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Which of the following has the same mean and mode?

4,3,4,3,4,6,4

2,3,7,3,8,3,2

4,2,2,1,3,2,3

6,2,5,4,3,4,1

None

The median and S.D of a distribution are 20 and 4 respectively. If each item is increased by 2, the new median are S.D are:

18, 6

22. 6

22, 4

20, 6

None

The median of the following data is 525. Find the values of x and y, if the total frequency is 100

Class Interval	Frequency
0-100	2
100-200	5
200-300	x
300-400	12
400-500	17
500-600	20
600-700	y
700-800	9
800-900	7
900-1000	4

x=15 y=18

x=15 y=9

x=5 y=9

x=9 y=15

None

9898,8998,9889,8899,9988,8989,9998. If the numbers above are arranged in an ascending or descending order. Which number will appear in the middle place?

9889

8998

8899

9898

None

For the following distribution:

Age (in yrs.)	No. of students
8	15
9	25
10	40
11	36
12	41
13	37
14	20
15	13
16	5
17	3

Their mode is

None

The median wage of the worker in the following table is

Wages/Week (Rs.)	No. of Workers	Cumulative Frequency (c.f)
50-59	15	15
60-69	40	55
70-79	50	105
80-89	60	165
90-99	45	210
100-109	40	250
110-119	15	265

Rs. 80.08

Rs. 82.08

Rs. 81.08

Rs. 84.08

None

In a frequency distributions, mode is 7.88, mean is 8.32, then median is

7.12

8.17

8.27

None

The marks of the students of a class who appeared for a test in English are represented in the following frequency table

Class Interval	Frequency
1-10	9
11-20	22
21-30	-
31-40	20
41-50	12
51-60	8
Total	100

That is/are the modal classes)?

10.5−20.5 only

20.5−30.5 only

10.5−20.5 and 20.5−30.5

There is no modal class

None

The ages of 40 girls in a class are given below:

Age (in years)	14	15	16	17	18
Number of Girls	5	8	15	10	2

Find the mean age.

13.9

14.9

15.9

16.9

None

10.

The modal class of the given frequency distribution is

Marks Obtained	10-20	20-30	30-40	40-50
Cumulative Frequency	7	35	27	34

30−40

20−30

40−50

10−20

None

11.

The median and mode respectively of a frequency distribution are 26 and 29. Then its mean is

24.5

25.8

28.4

27.5

None

12.

The number of trees in different parks of a city is 33,38,48,33,34,34,33 and 24. The mode of this data is

None

13.

The mode of the following series is 36. Find the missing frequency in it

Class Interval	Frequency
0-10	8
10-20	10
20-30	......
30-40	16
40-50	12
50-60	6
60-70	7

None

14.

The median class of the following distribution is ..............

x	5-10	10-20	20-30	30-40	40-50	50-60
f	4	8	12	16	9	5

5-10

30-40

20-30

50-60

None

15.

Read the following news report and answer on the basis of the same: For an examination, 60 students of a school appeared. Marks obtained by the 12 students were 25 each. The number of students who scored 20 and 5 each was three more than the students who scored 25. Also, 8 students who scored 10 marks each. The students who scored 15 marks each were half the students who scored 10 each and remaining students had scored 30 each. Answer the following question:

The series so obtained from the given paragraph is:

Continuous series

Discrete series

Individual series

No series can be obtained

None

16.

If the ratio of mean and median of a certain data is $5 : 7$ , then find the ratio of its mode and mean.

2:5

2:3

6:5

11:5

None

17.

The choices of the fruits of 42 students in a class are as follows:

A, O, B, M, A, G, B, G, A, G, B, M. A, O, M, A, B, G, M, B, A, O, M, O, G, B, O, M, G, A, A, B, M, O, M, G, B, A, M, O, M, O,

where A, B, G, M, and O stands for Apple, Banana, Grapes, Mango and Orange respectively.

which fruit is liked

by most of the students?

None

18.

Which of the following has the same mean, median and mode?

3,5,6,4,7,2,8

4,2,2,1,3,2,3

4,3,4,3,4,6,4

6 , 2, 5, 4 , 3, 4, 1

None

19.

If the mean of the following data is 20.2 then the value of p is

x	10	15	20	25	30
f	6	8	p	10	6

None

20.

The median of three positive integers, no two of which are equal, is 5. What is the least possible value of the arithmetic mean of these integers?

No such least possible value exists

None

Time's up

Ncert- Maths – Statistics -Set A

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