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

question 125

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 standard deviation of the number of vitamin supplements sold in this sample is ________.

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Definitions:

Reuptake

A process in neurotransmission where neurotransmitters released into the synaptic gap are reabsorbed back into the pre-synaptic neuron, affecting the intensity and duration of neurotransmission.

Synapse

The junction between two neurons or a neuron and a muscle cell where electrical or chemical signals are transmitted across the gap.

Neurotransmitter

Chemicals in the brain that transmit signals from one neuron to another, playing key roles in brain function and mood regulation.

Limbic System

A complex system of nerves and networks in the brain, involved with the control of emotions and memory.