Q3 of 48 Page 118

If class mark is 10 and class width is 6 then find the class.

We know that


Class size = upper limit – lower limit


⇒ Upper limit – lower limit = 6 ……(1)


Also,


⇒ Lower limit + upper limit = 2× 10


⇒ Lower limit + upper limit = 20 …..(2)


Adding (1) and (2)


⇒ 2(Upper limit) = 26


⇒ Upper limit = 13


And lower limit = 7


⇒ Class = 7-13


More from this chapter

All 48 →
1

For class interval 20-25 write the lower-class limit and the upper-class limit.

 2

Find the class-mark of the class 35-40.

 4

Complete the following table.

 5

In a ‘tree plantation’ project of a certain school there are 45 students of 'Harit Sena.' There cord of trees planted by each student is given below :

3, 5, 7, 6, 4, 3, 5, 4, 3, 5, 4, 7, 5 , 3, 6, 6, 5, 3, 4, 5, 7, 3, 5, 6, 4, 4, 3,5, 6, 6, 4, 3, 5, 7, 3, 4, 5, 7, 6, 4, 3, 5, 4, 4, 7.


Prepare a frequency distribution table of the data.