Find the Range and Standard Deviation for Each of the Two

Find the range and standard deviation for each of the two samples, then compare the two sets of results.
-When investigating times required for drive-through service, the following results (in seconds) were obtained. $\begin{array}{l|r|r|r|r|r|r|r|r}\text { Restaurant A } & 120 & 67 & 89 & 97 & 124 & 68 & 72 & 96 \\\hline \text { Restaurant B } & 115 & 126 & 49 & 56 & 98 & 76 & 78 & 95\end{array}$ Restaurant A: $57; 22.2$

A) Restaurant B: $77 ; 27.0$
Both measures indicate there is more variation in the data for restaurant B than the data for restaurant $A$ .

B) Restaurant A: $57; 22.2$
Restaurant B: $56 ; 32.9$
It is inconclusive as to which data set has more variation.

C) Restaurant A: $75; 22.2$
Restaurant B: $70; 27.0$
It is inconclusive as to which data set has more variation.

D) Restaurant A: $57; 25.0$
Restaurant B: $70; 27.0$
Both measures indicate there is more variation in the data for restaurant B than the data for restaurant $A$ .

Correct Answer:

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