Class mark of a class is __________
Upper limit + lower limit
upper limit - lower limit
Class mark is the midpoint of a class interval. Therefore, its formula is given by upper limit + lower limit2.
The class midpoint is equal to:
(a) The average of the upper class limit and the lower class limit.
(b) The product of upper class limit and the lower class limit.
(c) The ratio of the upper class limit and the lower class limit.
(d) None of the above.
Class mark, upper limit and lower limit of a class can be connected by using: