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CBSE Questions for Class 11 Commerce Economics Measures Of Central Tendency Quiz 6 - MCQExams.com

If a variable takes the discrete values α+4,α72,α52,α3,α2,α+12,α12,α+5(α>0) then the median is
  • α14
  • α12
  • α2
  • α+54
Find the mode of the following data:
90,40,68,90,50,60
  • 40
  • 68
  • 90
  • 50
Most frequently occuring values of a set of observation
  • Mean
  • Mode
  • Median
  • none
A school has four sections of chemistry in class XII having 40,35,45 and 42 students. The mean marks obtained in Chemistry test are 50,60,55 and 45 respectively for the four sections. The overall average of marks per students is -
  • 53
  • 43
  • 55.3
  • 52.25
7 kg of tea costing Rs. 280 per kg is mixed with 9 kg of tea costing Rs. 240 per kg. The average price per kg of the mixed tea is:
  • Rs. 255.80
  • Rs. 257.50
  • Rs. 267.20
  • Rs. 267.50
Find the median of the data a,ar,ar2,......arn where n is an odd number.
  • arn12
  • a2(1r)rn+12
  • a2(1+r)rn12
  • a2(1r)rn12
A car owner buys petrol at Rs. 7.50, Rs. 8 and Rs. 8.50 per litre for three consecutive years. What approximately is the average cost per litre if he spends Rs. 4000 each year?
  • Rs. 7.98
  • Rs. 8
  • Rs. 8.50
  • Rs. 9
The median of the set of the observation 1,3,5,7,11,13,17 is 
  • 1
  • 7
  • 9
  • 17
The median of the observations 3,18,6,16,12 and 10 is
  • 11
  • 10
  • 12
  • 20
In a test in Mathematics, 7 student scored 19 marks, 11 student scored 15 marks, 16 students 13 marks and 12 student scored 10 marks. The mode of the data is
  • 19 marks
  • 15 marks
  • 13 marks
  • 10 marks
The mean height of 25 male workers in a factory is 61 cm, and the mean height of 35 female workers in the same factory is 58 cm. The combined mean height of 60 workers in the factory is
  • 59.25
  • 59.5
  • 59.75
  • 58.75
The mean weight of 9 students is 25 kg. If one more student is joined in the group the mean is unaltered, then the weight of the 10th student is
  • 25 kg
  • 24 kg
  • 26 kg
  • 23 kg
The sum of 15 observations is 434+x. If the mean of the data is x, then find x.
  • 25
  • 27
  • 31
  • 33
The mode of the unimodular data 7,8,9,8,9,10,9,10,11,10,12 and x is 10. The value of x is 
  • 10
  • 9
  • 8
  • 11
Out of 5 brands of chocolates in a shop, a boy has to purchase the brand which is most liked by children . What measure of central tendency would be most appropriate if the data is provided to him?
  • Mean
  • Mode
  • Median
  • Any of the three
The mean of first ten odd natural number is
  • 5
  • 10
  • 20
  • 19
From a frequency distribution table if N=100,h=10;c.f.=38;f=18;L=50, then find the median for the distribution. Choose the correct alternative.
  • 56.67
  • 55.76
  • 56.76
  • 55.87
The mean of 100 observations is 50. If one of the observations which was 50 is replaced by150, the resulting mean will be :
  • 50.5
  • 51
  • 51.5
  • 52
A football player scored the following number of goals in the 10 matches:
1,3,2,5,8,6,1,4,7,9
Since the number of matches is 10 (an even number), therefore, the median
=5thobservation+6thobservation2
=8+62=7
Is it the correct answer and why?
  • Correct
  • Incorrect
  • Ambiguous
  • Data insufficient
If the mean of variate X in distribution 2.6, then the value of k is
Variate X12345
Frequency of X45k12
  • 8
  • 10
  • 12
  • 18
If the mean of the observations:
x,x+3,x+5,x+7,x+10 is 9, the mean of the last three observations is
  • 1013
  • 1023
  • 1113
  • 1123
The mean of 25 observations is 36. Out of these observations if the mean of first 13 observations is 32 and that of the last 13 observations is 40, the 13th observation is :
  • 23
  • 36
  • 38
  • 40
The median of the data
78,56,22,34,45,54,39,68,54,84 is
  • 45
  • 49.5
  • 54
  • 56
A total of 25 patients admitted to a hospital are tested for levels of blood sugar (mg/dl) and the results obtained were as follows:
87 71 83 67 85
77 69 76 65 85
85 54 70 68 80
73 78 68 85 73
81 78 81 77 75
Find mean, median and mode (mg/dl) of the above data.
  • Mean =75.64, Median =77, Mode =85
  • Mean =75.64, Median =76, Mode =81
  • Mean =75.64, Median =77, Mode =81
  • Mean =73.64, Median =76, Mode =85
The points scored by a basket ball team in a series of matches are as follows:
17,2,7,27,25,5,14,18,10,24,48,10,8,7,10,28
Find the median and mode for the data.
  • Median =12, mode =10
  • Median =11, mode =10
  • Median =12, mode =18
  • Median =10, mode =18
The mean marks (out of 100) of boys and girls in an examination are 70 and 73, respectively. If the mean marks of all the students in that examination is 71, find the ratio of the number of boys to the number of girls.
  • 1:1
  • 2:1
  • 1:2
  • 2:3
Mean of 50 observations was found to be 80.4. But later on, it was discovered that 96 was misread as69 at one place. Find the correct mean.
  • 75.9
  • 8.4
  • 79
  • 80.94
The median of a set of 9 distinct observations is 20.5. If each of the largest 4 observation of the set is increased by 2, then the median of the new set
  • is increased by 2
  • is decreased by 2
  • is two times the original median
  • remains the same as that of the original set
In a class of 100 students there are 70 boys whose average marks in a subject areIf the average marks of the complete class are 72, then the average marks of the girls :
  • 73
  • 65
  • 68
  • 74
If mode of the following data is 7, then the value of k in the 2,4,6,7,5,6,10,6,7,2k+1,9,7,13 is:
  • 3
  • 7
  • 4
  • 2
0:0:1


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