Question

Find the lower and upper limit of the first class with the class mark 15,25,35,45,55

Answer 1

Step-by-step explanation:

The class marks are uniformly spread.

The class size is the difference between anty two consecutive class marks.

Class size

= 25 - 15

= 10

The lower limit of the first class = 15-10/2

= 15 - 5

= 10

The upper limit of the first class= 15+10/2=

15 + 5=20

Thus, the first class interval is 10 - 20

Similarly, we can find the class limits of all the class marks given.

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Answer 2

Answer:

10 and 20

Step-by-step explanation:

Generally, class mark is middle value of the class

Therefore

middle value of 10 and 20 = 15