Final answer:
The class size for each bar can be determined by the width of each interval on the x-axis of the histogram. The type of skew in the shape of the distribution can be determined by the direction of the tail of the histogram.
Step-by-step explanation:
a. The class size for each bar in the histogram can be determined by the width of each interval on the x-axis. For example, if the x-axis intervals are: 0-10, 10-20, 20-30, then the class size for each bar would be 10.
b. To determine the type of skew in the shape of the distribution, you can look at the direction the tail of the histogram is pointing. If the tail is towards the right, it is a right-skewed distribution. If the tail is towards the left, it is a left-skewed distribution. If there is no tail and the bars are relatively equal in height, it is a symmetric distribution.