Instruction 3-3
the Stem-And-Leaf Display Below Represents the Number of Vitamin

question 86

Short Answer

Instruction 3-3
The stem-and-leaf display below represents the number of vitamin supplements sold by a health food store in a sample of 16 days.
$$\begin{array} { c l } \text { Stem } & \text { Leaves } \\\hline \hline 1 \mathrm { H } & 99 \\2 \mathrm {~L} & 0023 \\2 \mathrm { H } & 567 \\3 \mathrm {~L} & 034 \\3 \mathrm { H } & 568 \\4 \mathrm {~L} & 1\end{array}$$ Note (1): 1H means the "high teens" = 15,16,17,18,or 19;2L means the "low twenties" = 20,21,22,23,or 24;2H means the "high twenties" = 25,26,27,28,or 29,etc.
Note (2): For this sample,the sum of the observations is 448,the sum of the squares of the observations is 13,356,and the sum of the squared differences between each observation and the mean is 812.
-Referring to Instruction 3-3,the coefficient of variation of the number of vitamin supplements sold in this sample is ________ percent.

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Definitions:

Control Group

In an experiment, the group that does not receive the treatment and is used as a benchmark to measure how the other tested groups compare.

Music

A form of art that uses sound organized in time, often combining vocal or instrumental sounds to produce harmony, rhythm, and expression of emotion.

Productivity

The efficiency at which goods or services are produced, often measured in terms of output per unit of input.

Experimental Group

A group of subjects in an experiment who are exposed to the variable under study.