This relative frequency histogram shows the distribution of daily average temperatures (in degrees Fahrenheit) for a town over the course of 5 years.

Histogram from 60 to 78 by 1’s. Average daily temperature in degrees Fahrenheit. Beginning at 60 up to but not including 61, height of bar at each interval is point 0 0 1, point 0 0 7, point 0 1 3, point 0 2, point 0 5 2, point 0 7, point 0 8 7, point 1 2, point 1 5 9, point 1 3 2, point 1, point 0 9 8, point 0 7, point 0 3 2, point 0 2 3, point 0 1, point 0 0 4, point 0 0 2, 0.

Match each temperature interval with the proportion of days over the 5 years whose average temperature fell in that interval.

Two curves representing normal distributions are shown. Does the solid curve or dashed curve have a greater standard deviation? Explain how you know.

A bell-shaped distribution. The bell is centered 6 units right and 7.5 units up. Another bell-shaped distribution, a dotted line on the same axis, is shorter and wider. It is centered at 6 units right, 5 units up.

Here are 2 distributions.

How does the mean of Set A compare to the mean of Set B? Explain your reasoning.

Which distribution is symmetric?

Clare is designing an experimental study. She says that, in an experimental study, it is important to randomly assign people to groups because this helps reduce the likelihood of grouping subjects into groups that may differ on some characteristic that is related to the response of interest. Do you agree with Clare? Explain your reasoning.