Below Is a Frequency Distribution of Earnings of 50 Contractors

Multiple Choice

Below is a frequency distribution of earnings of 50 contractors in a country. $$\begin{array} { c c } \begin{array} { c } \text { Earnings } \\\end{array} & \text { Number of } \\\text { (thousands) }& \text { Contractors } \\1 - 10 & 2 \\11 - 20 & 7 \\20 - 30 & 12 \\ 31 - 40 & 15 \\41 - 50& 8 \\50 - 60 & 6\end{array}$$ Regarding this distribution, which of the following is correct?

A) The frequency distribution contains too many class intervals.
B) The class interval limits are ambiguous.
C) Too few classes were chosen.
D) The class intervals are too wide.