Use Cutpoint Grouping to Organize These Data into a Frequency

Use cutpoint grouping to organize these data into a frequency distribution.
-A government researcher was interested in the starting salaries of humanities graduates. A random sample of 30 humanities graduates yielded the following annual salaries. Data are in thousands of dollars, rounded to the nearest hundred dollars. $$\begin{array} { l l l l l l l l l l } 23.1 & 24.0 & 33.7 & 28.4 & 36.0 & 41.0 & 22.2 & 21.8 & 30.5 & 49.2 \\ 30.1 & 25.2 & 38.3 & 46.1 & 40.0 & 27.5 & 24.9 & 28.0 & 31.8 & 29.9 \\ 25.7 & 32.5 & 48.6 & 27.4 & 41.4 & 35.9 & 31.9 & 42.4 & 26.3 & 33.0 \end{array}$$ Construct a frequency distribution for these annual starting salaries. Use 20 as the first cutpoint and classes of equal width 4 .

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