Question

Isabel is taking a self-paced math class. Her scores for each of the 19 quizzes during the academic year are shown below. Complete the grouped relative frequency distribution for the data. Write each relative frequency as a decimal rounded to the nearest hundredth, not as a percentage. ( note that we are using a class width of 5)

Answer 1

Given the data below:

To determine the relative frequency, given that the class width is 5,

we have

`\begin{gathered} score:\text{ 79 to 83} \\ relative\text{ frequency = }(8)/(19)=0.42 \\ score:84\text{ to 88} \\ relative\text{ frequency = }(1)/(9)=0.11 \\ score:89\text{ to 93} \\ relative\text{ frequency=}(6)/(19)=0.32 \\ score:94\text{ to 98} \\ relative\text{ frequency=}(4)/(19)=0.21\sqrt{\placeholder{⬚}} \end{gathered}`

Hence, we have