# Find the Actual Lower and Upper-class Limits and Also the Class Marks of the Classes: 1.1 - 2.0, 2.1 -3.0 and 3.1 - 4.0 - Mathematics

Sum

Find the actual lower and upper-class limits and also the class marks of the classes:
1.1 - 2.0, 2.1 -3.0 and 3.1 - 4.0.

#### Solution

In the case of frequency 1.1 - 2.0 the lower class limit is 1.1, upper-class limit is 2.0 and classmark

is  (1.1 + 2.0)/(2) = 1.55

In the case of frequency 2.1 - 3.0 the lower class limit is 2.1, upper-class limit is 3.0 and classmark

is  (2.1 + 3.0)/(2) = 2.55

In the case of frequency 3.1 - 4.0 the lower class limit is 3.1, the upper class limit is 4.0 and classmark

is  (3.1 + 4.0)/(2) = 3.55

Concept: Class Intervals and Class Limits
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#### APPEARS IN

Selina Concise Mathematics Class 9 ICSE
Chapter 18 Statistics
Exercise 18 (A) | Q 6 | Page 228