The class-mark of the class 130-150 is :
a. 130
b. 135
c. 140
d. 145
Solution:
We have to find the class mark of the class 130-150
Class mark = Average of 130 and 150
It can be written as
Class mark = (130 + 150)/2
By further calculation
Class mark = 280/2
Class mark = 140
Therefore, the class mark is 140.
✦ Try This: The class-mark of the class 120-140 is : a. 130, b. 135, c. 140, d. 145
We have to find the class mark of the class 120-140
Class mark = Average of 120 and 140
It can be written as
Class mark = (120 + 140)/2
By further calculation
Class mark = 260/2
Class mark = 130
Therefore, the class mark is 130.
☛ Also Check: NCERT Solutions for Class 9 Maths Chapter 14
NCERT Exemplar Class 9 Maths Exercise 14.1 Sample Problem 2
The class-mark of the class 130-150 is : a. 130, b. 135, c. 140, d. 145
Summary:
Class mark, in statistics, is the average of the upper limit and the lower limit of a class in a frequency distribution. The class-mark of the class 130-150 is 140
☛ Related Questions:
visual curriculum