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# The class marks of a continuous distribution are :

1.04, 1.14, 1.24, 1.34, 1.44, 1.54 and 1.64

Is it correct to say that the last interval will be 1.55 - 1.73? Justify your answer.

**Solution:**

We know that

__Class mark__ is the mid point of a class interval

The difference between two consecutive class marks is equal to the class size

1.14 - 1.04 = 0.1

1.24 - 1.14 = 0.1

1.34 - 1.24 = 0.1

Here the class size is 0.1

Class interval 1.55 - 1.73, (1.73 - 1.55) = 0.18 is not equal to the class size.

So it cannot be the last interval of the class marks

Therefore, class interval 1.55 - 1.73 cannot be the correct class interval for the class marks given.

**✦ Try This: **The class marks of a continuous distribution are: 1.05, 1.15, 1.25, 1.35, 1.45, 1.55 and 1.65. Is it correct to say that the last interval will be 1.54 - 1.72? Justify your answer.

**☛ Also Check:** NCERT Solutions for Class 9 Maths Chapter 14

**NCERT Exemplar Class 9 Maths Exercise 14.2 Problem 6**

## The class marks of a continuous distribution are : 1.04, 1.14, 1.24, 1.34, 1.44, 1.54 and 1.64. Is it correct to say that the last interval will be 1.55 - 1.73? Justify your answer.

**Summary:**

The class marks of a continuous distribution are 1.04, 1.14, 1.24, 1.34, 1.44, 1.54 and 1.64. It is not correct to say that the last interval will be 1.55 - 1.73

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