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RD Chapter 7- Statistics Ex-7.4 Interview Questions Answers

Question 1 :
Following are the lives in hours of 15 pieces of the components of aircraft engine. Find the median :
715, 724, 725, 710, 729, 745, 694, 699, 696, 712, 734, 728, 716, 705, 719

Answer 1 :

Arranging in ascending order, we get
694, 696, 699, 705, 710, 712, 715, 716, 719, 724, 725, 728, 729, 734, 745 Here N = 15 which is odd

Question 2 :
The following is the distribution of height of students of a certain class in a certain city :
 
Find the median height.

Answer 2 : Arranging the classes in exclusive form and then forming its cumulative frequency table as given

Question 3 : Following is the distribution of I.Q. of 100 students. Find the median I.Q.

Answer 3 :

Arranging the classes in exclusive form and then forming it in cumulative frequency table as shown below :
 
Here N = 100
∴ N/2 = 100/2 = 50
∴ Corresponding median class is = 94.5-104.5
l = 94.5, f= 33, F = 34 and h = 10

Question 4 : Calculate the median from the following data :

Answer 4 : Writing the given data in cumulative frequency table as shown

Question 5 : Calculate the median from the following data :

Answer 5 :