The real lower limit and the real upper limit of the interval 40-49 are

a. 39.5 and 49.5.

b. 40 and 50.

c. 39 and 50.

d. 40 and 49.

Assume that you have a set of data with 70 values spread fairly evenly between 0 and 100. The optimal number of categories for a histogram of these data would be approximately

Group of answer choices

a. 25

b. 4

c. 50

d. 10