In constructing a frequency table, Sturges' guideline suggests that the ideal number of classes can be approximated

Question:

In constructing a frequency table, Sturges' guideline suggests that the ideal number of classes can be approximated by 1 + (log «)/(log 2), where n is the number of values. Use this guideline to suggest a tentative number of classes (rounded off) for constructing a frequency table from a data set with each number of values.
a. 50
b. 100
c. 150
d. 500
e. 1000
f. 50,000