\begin{tabular}{|l|l|l|}
\hline
[tex]$16,000-16,999$[/tex] & & \\
\hline
[tex]$17,000-17,999$[/tex] & & \\
\hline
[tex]$18,000-18,999$[/tex] & & \\
\hline
[tex]$19,000-19,999$[/tex] & & \\
\hline
[tex]$20,000-20,999$[/tex] & & \\
\hline
& & \\
\hline
\end{tabular}

What are the frequencies for each interval?

a. Frequency

16,000-16,999: 20

17,000-17,999: 3

18,000-18,999: 1

19,000-19,999: 1

20,000-20,999: 0

b. Frequency

16,000-16,999: 19

17,000-17,999: 5

18,000-18,999: 1

19,000-19,999: 1

20,000-20,999: 0

c. Frequency

16,000-16,999: 20

17,000-17,999: 4

18,000-18,999: 1

19,000-19,999: 1

20,000-20,999: 1

d. Frequency

16,000-16,999: 19

17,000-17,999: 3

18,000-18,999: 1

19,000-19,999: 1

20,000-20,999: 1