Answer
See the picture.
Work Step by Step
Total: 35 trading days.
The relative frequency for "6.00 - 8.99" is $\frac{15}{35}\approx0.4286$
The relative frequency for "9.00 - 11.99" is $\frac{9}{35}\approx0.2571$
The relative frequency for "12.00 - 14.99" is $\frac{4}{35}\approx0.1143$
The relative frequency for "15.00 - 17.99" is $\frac{4}{35}\approx0.1143$
The relative frequency for "18.00 - 20.99" is $\frac{2}{35}\approx0.0571$
The relative frequency for "21.00 - 23.99" is $\frac{1}{35}\approx0.0286$
