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

question 120

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.
$$\begin{array} { | l | l | } \hline \text { Stem } & \text { Leaves } \\\hline \text { 1H } & 99 \\\hline \text { 2L } & 0023 \\\hline \text { 2H } & 567 \\\hline \text { 3L } & 034 \\\hline \text { 3H } & 568 \\\hline \text { 4L } & 1 \\\hline\end{array}$$ 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 variance of the number of vitamin supplements sold in this sample is _____________ .

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Definitions:

Flanges

Rims, edges, ribs, or collars, often with attached bolts, used to strengthen or attach an object, such as pipes, to another.

Steel Scriber

A tool with a hardened steel point used for marking measurements or cutting lines on metal surfaces.

Ladder Frame

A type of vehicle frame construction resembling a ladder, with two longitudinal rails connected by several cross members.

Longitudinal Members

Structural components of a vehicle's chassis that run lengthwise, providing strength and stability to the vehicle's body.