(I a Frequency Distribution Is Grouping of Data into Classes

(i. A frequency distribution is grouping of data into classes showing the number of observations in each class. (ii) The midpoint of a class, which is also called a class mark, is halfway between the lower and upper limits.
(iii) A class interval, which is the width of a class, can be determined by subtracting the lower limit of a class from the lower limit of the next higher class.

A) (i) , (ii) and (iii) are all correct statements.
B) (i) and, (ii) are correct statements but not (iii) .
C) (i) and, (iii) are correct statements but not (ii) .
D) (ii) and, (iii) are correct statements but not (i) .