(statistics)
a grouped frequency distribution has class intervals of 120 to 122, 123 to 125, 126 to 128, 129 to 131, and 132 to 134.

a. identify the lower and upper stated limits for the class interval of 123 to 125.
b. identify the lower and upper stated limits for the class interval of 129 to 131.
c. identify the lower and upper real limits for the class interval of 123 to 125.
d. identify the lower and upper real limits for the class interval of 129 to 131.
e. find the midpoint of the class interval of 120 to 122.
f. what is the value of i for this distribution