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

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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.

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Solution

In the case of frequency 1.1 - 2.0 the lower-class limit is 1.05, upper-class limit is 2.05 and classmark.

is 1.05 - 2.05

 `(1.05 + 2.05)/(2)`

= `3.10/2`

= 1.55

In the case of frequency 2.1 - 3.0 the lower-class limit is 2.05, upper-class limit is 3.05 and classmark.

is 2.05 - 3.05

`(2.1 + 3.0)/(2)`

= `5.10/2`

= 2.55

In the case of frequency 3.1 - 4.0 the lower class limit is 3.05, the upper class limit is 4.05 and classmark.

is 3.05 - 4.05

`(3.1 + 4.0)/(2)`

= `7.10/2`

= 3.55

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Chapter 18: Statistics - Exercise 18 (A) [Page 228]

APPEARS IN

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

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