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CBSE Questions for Class 11 Commerce Economics Measures Of Central Tendency Quiz 7 - MCQExams.com

If in a data, 10 numbers arranged in increasing order. If the 7th entry is increased by 4, then the median increases by
  • zero
  • 4
  • 6
  • 5
The numbers 3,5,7 and 9  have their respective frequencies x2,x+2,x3  and x+3. If the arithmetic mean is 6.5, then the value of x is
  • 3
  • 4
  • 5
  • 6
Mode of the data
15,14,19,20,14,15,16,14,15,18,14,19,15,17,15 is
  • 14
  • 15
  • 16
  • 17
The mean is
  • 70
  • 68
  • 71
  • 69
Median of the following numbers:
4,4,5,7,6,7,7,12,3 is
  • 4
  • 5
  • 6
  • 7
The number of observations in a group is 40 . If the average of first  10  is  4.5  and that of the remaining  30  is  3.5, then the average of the whole group is
  • 15
  • 154
  • 4
  • 8
The mean weight of 20  students is 25 kg and the mean weight of another 10 students is 40 kg. Find the mean weight of the 30 students.
  • 20
  • 30
  • 40
  • 50
If three sets of data had means of 15,22.5 and  24  based on 6,4, and 5 observations respectively, then the mean of these three sets combined is
  • 20.0
  • 20.5
  • 22.5
  • 24.0
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Assertion is incorrect but Reason is correct
The mean of the following distribution is
class
Frequency
0-5
4
5-10
5
10-15
7
15-20
12
20-25
7
25-30
5

  • 15
  • 16
  • 17
  • 18
The numbers 4,6 and 8  are the frequencies of (x+2),x and (x1) respectively . If their arithmetic mean is 8,  the value of  x  is
  • 5
  • 6
  • 7
  • 8
A contractor employed 18  labourers at Rs. 12 per day, 10 labourers at Rs.13.50 per  day,5 labourers at Rs.25 per  day and 2 labourers at Rs.42 per day. The average  wage of a labourer per day is 
  • Rs. 16
  • Rs. 20
  • Rs.24
  • Rs. 28
In a class test in English 10 students scored 75 marks, 12 students scored 60 marks, 8 scored 40 marks and 3 scored 30 marks, the mode  for their score is
  • 75
  • 30
  • 60
  • 25
The median of the following numbers 25,27,21,23,24 is ___________.
  • 21
  • 23
  • 25
  • 24
The examination marks of 250 pupils are recorded below. Find the mean.
Class interval
0-9
10-19
20-29
30-39
40-49
Frequency
0
2
6
24
36
Class interval
50-59
60-69
70-79
80-89
90-99
Frequency
47
55
40
27
13
  • 50.12
  • 90.31
  • 60.82
  • 75.12
The marks of 20 students in a test were as follows:
5,6,8,9,10,11,11,12,13,13,14,14,15,15,15,16,16,18,19,20
The median is
  • 13.5
  • 12.5
  • 14.5
  • 15.5
The median of variables 5, 8, 10, 13, 17, 21, 27, 30, 33, 42 is
  • 21
  • 17
  • 38
  • 19
Arithmetic mean for the given data is
Marks
No. of students
0 - 10
10 - 20
20 - 30
30 - 40
40 - 50
50 - 60
5
10
25
30
20
10

  • 55
  • 35
  • 2
  • 33
The average weight of 10 men is decreased by 3 kg  when one of them whose weight is 80kg  is replaced by a new person. The weight of the new person is
  • 70
  • 60
  • 50
  • 73
In a family, there are 8 men, 7 women and 5 children whose mean ages separately are respectively 24,20 and 6 years. The mean age of the family is
  • 17.1 years
  • 18.1 years
  • 19.1 years
  • none of these
Marks obtained by 60 students of a class are shown as 
Marks30-40 40-50 50-6060-7070-8080-9090-100
Number
of students
8 7f1155f27
the mean marks are 64, then f1 : f2 is
  • 7:4
  • 4:5
  • 5:4
  • None of these
A group of 10 items has arithmetic mean 6. If the arithmetic mean of 4 of these items is 7.5, then the mean of the remaining items is
  • 6.5
  • 5.5
  • 4.5
  • 5.0
The daily wages (in Rs.) of ten workers are 20,25,17,18,8,15,22,11,9,14. The median of wages is
  • 15
  • 16
  • 17
  • 14
The number of observations in a group is 40. If the average of first 10 is 4.5 and that of the remaining 30 is 3.5, then the average of the whole group is:
  • 154
  • 15
  • 8
  • 4
Obtain the median for the following frequency distribution
x:
1
2
3
4
5
6
7
8
9
f :
8
10
11
16
20
25
15
9
6

  • 6
  • 4
  • 3
  • 5
If xi's are the mid points of the class intervals of grouped data, f1's are the corresponding frequencies and ˉx is the mean, then (fixiˉx) is equal to
  • 0
  • 1
  • 1
  • 2
If ui=xi2510,fiui=20 and fi=100, then ¯x is equal to
  • 27
  • 25
  • 30
  • 35
A firm of readymade garments make both men's and women's shirt. Its profit average is 6% of sales. Its profits in men's shirt average 8% of sales and women's shirts comprise 60% of output. The average profit per sales rupee in women's shirts is :
  • 0.0466
  • 0.0166
  • 0.0666
  • None of these
Following table gives frequency distribution of trees planted by different housing societies in a particular locality.
Find mean number of trees planted by housing society by using 'step deviation method'.
No. of tress10 - 1515 - 2020 - 2525 - 3030 - 3535 - 40
No. of Societies279864
  • 25.42 trees
  • 27.42 trees
  • 29.42 trees
  • 31.42  trees
The results of two colleges are as follows: then
M.AM.Sc.B.A.B.Sc.Total
AAppeared

10060120200480
passed904575150360
BAppeared

240200160200800
Passed200160100140600
  • A is better than B
  • None is better than the other
  • A is inferior to B
  • can not say
0:0:1


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