JEE Questions for Maths Statistics Quiz 9 - MCQExams.com


Maths-Statistics-51150.png

  • Maths-Statistics-51151.png
  • 2)
    Maths-Statistics-51152.png

  • Maths-Statistics-51153.png
  • None of these

Maths-Statistics-51155.png
  • 4
  • 5
  • 6
  • 7

Maths-Statistics-51157.png

  • Maths-Statistics-51158.png
  • 2)
    Maths-Statistics-51159.png

  • Maths-Statistics-51160.png
  • None of these

Maths-Statistics-51162.png

  • Maths-Statistics-51163.png
  • 2)
    Maths-Statistics-51164.png

  • Maths-Statistics-51165.png

  • Maths-Statistics-51166.png

Maths-Statistics-51167.png
  • Lower limit
  • Assumed mean
  • Number of observations
  • Class size

Maths-Statistics-51169.png

  • Maths-Statistics-51170.png
  • 2)
    Maths-Statistics-51171.png

  • Maths-Statistics-51172.png

  • Maths-Statistics-51173.png

Maths-Statistics-51175.png
  • 75
  • 157
  • 82
  • 80

Maths-Statistics-51177.png
  • 9
  • 12
  • 15
  • 18

Maths-Statistics-51179.png

  • Maths-Statistics-51180.png
  • 2)
    Maths-Statistics-51181.png

  • Maths-Statistics-51182.png

  • Maths-Statistics-51183.png
The class marks of a distribution are 6, 10, 14, 18, 22, 26, 30 then the class size is
  • 4
  • 2
  • 5
  • 8
The reciprocal of the mean of the reciprocals of n observations is their
  • A.M.
  • G.M.
  • H.M.
  • None of these
The mean weight per student in a group of seven students is 55 kg. If the individual weights of 6 students are 52, 58, 55, 53, 56 and 54; then weights of the seventh student is
  • 55 kg
  • 60 kg
  • 57 kg
  • 50 kg
If the algebraic sum of deviations of 20 observations from 30 is 20, then the mean of observations is
  • 30
  • 30.1
  • 29
  • 31
The weighted mean of first n natural numbers whose weights are equal to the squares of corresponding numbers is

  • Maths-Statistics-51187.png
  • 2)
    Maths-Statistics-51188.png

  • Maths-Statistics-51189.png

  • Maths-Statistics-51190.png

Maths-Statistics-51192.png
  • 1
  • n

  • Maths-Statistics-51193.png

  • Maths-Statistics-51194.png
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

  • Maths-Statistics-51196.png
  • 2)
    Maths-Statistics-51197.png
  • 4
  • 8
A student obtain 75%, 80% and 85% in three subjects. If the marks of another subject are added, then his average cannot be less than
  • 60%
  • 65%
  • 80%
  • 90%
The average marks of boys in a class is 52 and that of girls is 42. The average marks of boys and girls combined is 50. The percentage of boys in the class is
  • 40
  • 20
  • 80
  • 60
The A.M. of a 50 set of numbers is 38. If two numbers of the set, namely 55 and 45 are discarded, the A.M. of the remaining set of numbers is
  • 38.5
  • 37.5
  • 36.5
  • 36
An automobile driver travels from plane to a hill station 120 km distant at an average speed of 30 km per hour. He then makes the return trip at an average speed of 25 km per hour. He covers another 120 km distance on plane at an average speed of 50 km per hour. His average speed over the entire distance of 360 km will be

  • Maths-Statistics-51202.png
  • 2)
    Maths-Statistics-51203.png

  • Maths-Statistics-51204.png
  • None of these
The average weight of students in a class of 35 students is 40 kg. If the weight of the teacher be included, the average rises by 1/2 kg; the weight of the teacher is
  • 40.5 kg
  • 50 kg
  • 41 kg
  • 58 kg

Maths-Statistics-51207.png

  • Maths-Statistics-51208.png
  • 2)
    Maths-Statistics-51209.png

  • Maths-Statistics-51210.png

  • Maths-Statistics-51211.png
The A.M. of n observations is M. If the sum of n – 4 observations is a then the mean of remaining 4 observations is

  • Maths-Statistics-51213.png
  • 2)
    Maths-Statistics-51214.png

  • Maths-Statistics-51215.png

  • Maths-Statistics-51216.png
If the mean of the distribution is 2.6, then the value of y is
Variate x 1 2 3 4 5
Frequency f of x 4 5 y 1 2
  • 24
  • 13
  • 8
  • 3
In a class of 100 students there are 70 boys whose average marks in a subject are 75. If the average marks of the complete class are 72, then what are the average marks of the girls
  • 73
  • 65
  • 68
  • 74

Maths-Statistics-51220.png

  • Maths-Statistics-51221.png
  • 2)
    Maths-Statistics-51222.png

  • Maths-Statistics-51223.png

  • Maths-Statistics-51224.png
The harmonic mean of 4, 8, 16 is
  • 6.4
  • 6.7
  • 6.85
  • 7.8
Mean of 100 items is 49. It was discovered that three items which should have been 60, 70, 80 were wrongly read as 40, 20, 50 respectively. The correct mean is
  • 48
  • 2)
    Maths-Statistics-51227.png
  • 50
  • 80
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 over all average of marks per students is
  • 53
  • 45
  • 55.3
  • 52.25
The arithmetic mean of 7 consecutive integers starting with a is m. Then, the arithmetic mean of 11 consecutive integers starting with a+2 is

  • Maths-Statistics-51230.png
  • 2)
    Maths-Statistics-51231.png

  • Maths-Statistics-51232.png

  • Maths-Statistics-51233.png

  • Maths-Statistics-51234.png
0:0:1


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