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.

(B) The class marks of the continuous distribution are $1.04, 1.14, 1.24, 1.34, 1.44, 1.54$,and $1.64$.
The difference between two consecutive class marks is $h = 1.14 - 1.04 = 1.24 - 1.14 = \dots = 1.64 - 1.54 = 0.10$.
This difference $h$ represents the class size of the continuous distribution.
The class size of the interval $1.55 - 1.73$ is $1.73 - 1.55 = 0.18$.
Since the class size of the given interval $(0.18)$ is not equal to the class size of the distribution $(0.10)$,it is not correct to say that the last interval is $1.55 - 1.73$.