The following are yield in quintals of wheat harvested by thirty farmers per hectare. 42 39 26 18 22 52 24 12 24 32 48 16 33 28 29 30 56 16 36 62 24 38 16 14 32 19 21 30 78 54 Prepare a grouped frequency distribution, using 11 classes. Answer the following questions.
a. What is the lower class limit for the third class?
b. What is the lower class boundary for the seventh class?
c. Determine the correction factor for this frequency distribution.
d. What is the class mark of the second class?
e. Find the difference between the class marks of the eighth and ninth classes.