The Frequency Distribution Below Was Constructed from Data Collected on the Quarts

Essay

The frequency distribution below was constructed from data collected on the quarts of soft drinks consumed per week by 20 students.
$$\begin{array} { c c } \text { Qurarts af } & \\\text { Soft Drink } & \text { Frequency } \\0-3 & 4 \\4-7 & 5 \\8-11 & 6 \\12-15 & 3 \\16-19 & 2\end{array}$$
a. Construct a relative frequency distribution.
b. Construct a cumulative frequency distribution.
c. Construct a cumulative relative frequency distribution.