Answer
a. mode
b. mode
c. median
d. mode
e. mean
f. mean or means
Work Step by Step
a. The most typical case is desired. mode which happens with the highest frequency
b. The distribution is open-ended. mode when mean and median values are hard to get
c. There is an extreme value in the data set. median which minimize the influences of extreme values
d. The data are categorical. mode when mean and median values are hard to get
e. Further statistical computations will be needed. mean which represents the average of all values
f. The values are to be divided into two approximately equal groups, one group containing the larger values and one containing the smaller values. mean or means of individual groups