In the context of constructing a frequency distribution, which statement best distinguishes class midpoints from class boundaries?

A survey records the number of books read by $28$ students during the summer: $2,7,5,9,12,6,4,10,8,3,15,11,13,14,5,7,8,6,12,9,10,4,3,2,1,13,14,15$. Construct a frequency distribution using $5$ classes. Include class midpoints, relative frequencies, and cumulative frequencies.

A class has a frequency of 8 in a data set of 40 observations. What is the relative frequency as a percentage?

Construct a frequency distribution for the data given below about the magnitudes of recent earthquakes recorded worldwide. Can we conclude that the magnitudes appear to have a normal distribution?

$\text{4.5, 5.1, 6.2, 4.8, 5.6, 6.8, 7.1, 5.3, 4.9, 6.0, 5.8, 4.7, 5.2, 6.5, 7.3, 4.6, 5.9, 6.1, 5.4, 4.8, 6.7, 7.0, 5.5, 4.9, 6.3, 5.7, 6.9, 5.0, 4.6, 7.2}$

A cumulative frequency ogive graph for the weights (in kilograms) of a group of students is given below. Use the graph to estimate the total number of students.

A researcher collects the cholesterol levels (in units of $\text{mg/dL}$) of a sample of adults. The data ranges from $120$ to $240$. She considers two frequency distributions: one with a first class lower limit of $120$ and class width of $20$, and another with class width of $10$. Which frequency distribution is likely to provide a better summary of the cholesterol data? Explain.

What is the main purpose of constructing a frequency distribution before creating charts or graphs?

A meteorology team recorded the wind speeds (in km/h) of storms over a period of time. The frequency distribution of wind speeds is given below.

Using the frequency distribution above, find:

(i) The class limits of the first class

(ii) The class boundaries of the first class

(iii) The class midpoint of the first class

Given the following data set of $32$ exam scores, construct a frequency distribution and frequency histogram using $8$ classes.

$56$, $78$, $62$, $90$, $85$, $73$, $68$, $81$, $95$, $77$, $64$, $88$, $70$, $83$, $60$, $92$, $80$, $75$, $67$, $86$, $72$, $79$, $65$, $89$, $74$, $84$, $61$, $93$, $69$, $87$, $66$, $82$

In a statistics class, students are asked to graph the distribution of test scores. Which graph should they use to determine how many students scored below a certain value, and what is the main feature of this graph?