Question: Frequency \[ \begin{array}{c|c} 63 & 66 \\ 66 & 69 \\ 69 & 72 \\ 72 & 75 \\ 75 & 78 \\…

Frequency

\[ \begin{array}{c|c} 63 & 66 \\ 66 & 69 \\ 69 & 72 \\ 72 & 75 \\ 75 & 78 \\ 78 & 81 \\ 81 & 84 \\ 84 & 87 \\ 87 & 90 \\ 90 & 93 \\ 93 & 96 \\ \end{array} \]

Final Grade Score

Part: 0 / 4

Part 1 of 4

(a) How many classes are there?

There are 11 classes.

Part: 1 / 4

Part 2 of 4

(b) What is the class width?

The class width is \(\boxed{\text{ }}\).

Solution

(a) The answer provided is that there are 11 classes. (b) To find the class width, follow these steps: First, identify the range of the data. The final grade scores on the x-axis range from 60 to 95. Next, calculate the class width by dividing the range by the number of classes. The range is \(95 - 60 = 35\). Now divide the range by the number of classes: \[ \text{Class width} = \frac{35}{11} \approx 3.18 \] Therefore, the class width is approximately 3.