Suppose a class obtained the following scores on a test. $\text { cellpadding }=" 0 " \text { cellspacing }=" 0 " \text { width }=" 34 \% \text { " border="0" }$

$\begin{array}{ll}
\text { Score } & \text { Frequency } \
90 & 2 \
80 & 1 \
70 & 9 \
60 & 6 \
50 & 2 \
40 & 1
\end{array}$
What is the mean? Round the answer to two decimal places as needed.
A) 66.19
B) 63.81
C) 65
D) 70
E) 3.5

Question

Suppose a class obtained the following scores on a test. $\text { cellpadding }=" 0 " \text { cellspacing }=" 0 " \text { width }=" 34 \% \text { " border="0"> }$

$\begin{array}{ll}
\text { Score } & \text { Frequency } \
90 & 2 \
80 & 1 \
70 & 9 \
60 & 6 \
50 & 2 \
40 & 1
\end{array}$
 What is the mean? Round the answer to two decimal places as needed.
A) 66.19
B) 63.81
C) 65
D) 70
E) 3.5

Quizplus · Accepted Answer

To calculate the mean, multiply each score by its frequency, sum those products, and then divide by the total number of scores. The calculation is as follows: $\frac{(90*2) + (80*1) + (70*9) + (60*6) + (50*2) + (40*1)}{2+1+9+6+2+1} = \frac{180 + 80 + 630 + 360 + 100 + 40}{21} = \frac{1390}{21} = 66.19$.

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