State true or false.
The class marks of a continuous distribution are 1.04, 1.14, 1.24, 1.34, 1.44, 1.54 and 1.64. The last interval will be 1.55-1.73.

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True

False

answer is B.

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Detailed Solution

Given the class marks are 1.04, 1.14, 1.24, 1.34, 1.44, 1.54 and 1.64.
A class interval's midpoint is referred to as the class mark.
A class's size is always equal to the difference between any two consecutive grades.
Now,

⇒ 1.14 − 1.04 = 0.1

⇒ 1.24 − 1.14 = 0.1

⇒ 1.34 − 1.24 = 0.1

and so on
Class size = 0.1
But in the class interval (1.55-1.73), 1.73 - 1.55 = 0.18 which is not equal to the class size found previously.
Given statement is false as class interval (1.55-1.73) cannot be the correct class interval for the given class marks.
Hence, the correct option is 2.

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