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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.

The class marks of a continuous distribution are :

1.04, 1.14, 1.24, 1.34, 1.44, 1.54\text { and}\ 1.64

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

Answers (1)

Answer: As we know that class is the mid-point of a class interval.

\Rightarrow So, Difference between two consecutive class marks is always equal to the class size.

Class-marks Difference
1.14-1.04 0.1
1.24-1.14 0.1
1.34-1.24 0.1
1.44-1.34 0.1
1.54-1.44 0.1
1.55-1.73 0.8

So, we can see that the last class size is 0.8, which is not equal to the class size found previously.

Hence it cannot be the correct class interval for the given class marks.

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infoexpert23

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