Important Questions of Statistics Mathematics | Zigya

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51.

A data set of n observations has mean 2M, while another data set of 2n observations has mean M. What is the mean of the combined data sets ?

  • M

  • 3M2

  • 2M3

  • 4M3


52.

The sum of deviations of n number of observations measured from 2.5 is 50. The sum of deviations of the same set of observations measured from 3.5 is 50. What is the value of n ?

  • 50

  • 60

  • 80

  • 100


53.

What is the standard deviation of the observations

- 6, - 5, - 4, - 1, 1, 4, 5, 6 ?

  • 2

  • 2

  • 22

  • 4


54.

Read the following information and answer the three items that follow :

What is the mean of marks in Physics ?

  • 38.4

  • 39.4

  • 40.9

  • 41.6


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55.

Read the following information and answer the three items that follow :

Consider the following statements:

  1. Modal value of the marks in Physics lies in the interval 30 40.
  2. Median of the marks in Physics is less than that of marks in Mathematics.

Which of the above statements is/are correct ?

  • 1 only

  • 2 only

  • Both 1 and 2 

  • Neither 1 nor 2


56.

Read the following information and answer the three items that follow :

The difference between number of students under Physics and Mathematics is largest for the interval

  • 20- 30

  • 30 – 40

  • 40 - 50

  • 50 - 60


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