The mean of monthly electric bill is $112.80
It should be noted that the mean simply means the average of a give set of numbers.
This will be:
= ($115 + $150 + $144 + $126 + $90 + $90 + $95 + $110 + $120 + $88)/10
= $1128/10
= $112.80
Therefore, the mean of monthly electric bill is $112.80
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