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
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
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
Read the following information and answer the three items that follow :
Consider the following statements:
Which of the above statements is/are correct ?
1 only
2 only
Both 1 and 2
Neither 1 nor 2
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