​Calculate the mean, variance and standard deviation for the following distribution :-
Marks : above 30&below 40  below 50  below 60  below 70  below 80  below 90  below 100
No. of Students :3  10  22  37  45  48  50
 

Dear student
Marks Number of students xi di=xi-A ui=di/h fiui
30-40 3 35 -30 -3 -9
40-50 7 45 -20 -2 -14
50-60 12 55 -10 -1 -12
60-70 15 65 0 0 0
70-80 8 75 10 1 8
80-90 3 85 20 2 6
90-100 2 95 30 3 6
  N=50       fiui=-15
Mean=A+h1Nfiui=65+10-1550=65-3=62
For remaining queries we request you to post them in separate threads to have rapid assistance from our experts.
Regards

  • -2
What are you looking for?