Question

Sara's grades are 78, 72, 66, 80, and 84. Sara decides to study hard for the final. Her score is 100. As an outlier, how does

100 affect the mean of Sara's previous scores? Assume all scores are treated equally.
A)
The outlier did not affect the mean.
B)
The outlier raised the mean by 4 points.
C)
The outlier lowered the mean by 2 points.
D)
The outlier raised the mean by 2 points.

Answer 1

B

Explanation:

The Mean(Average) of 78+72+66+80+84 is 76 because (78+72+66+80+84)/5* and (78+72+66+80+84+100)/6* is 80.

*You get this number by counting the number of numbers you entered (78+72+66+80+84) there are 5 numbers.