Katie works as a waitress and records her monthly tips in the table shown below. if katie decided not to work the month of november, how would her five month average compare to her six month average for monthly tips?

june
july
august
septemper
october
november
$133.45
$235.31
$239.45
$258.87
$298.45
$115.67
a.
her monthly average would have decreased by $19.57.
b.
her monthly average would have increased by $19.57.
c.
her monthly average would have increased by $2.07.
d.
her monthly average would have decreased by $2.07.

A

Step-by-step explanation:

The average is the sum of all the numbers divided by the number of numbers.

Average of first 5 months (excluding november) :  

If she works the month of november, the average of the 6 months would be:

Average of 6 months (including november):  

So we see that the average decreases. It lessens by  233.11 - 213.54 = 19.57.

Correct answer A.

A

Step-by-step explanation:

The average is the sum of all the numbers divided by the number of numbers.

Average of first 5 months (excluding november) :  

If she works the month of november, the average of the 6 months would be:

Average of 6 months (including november):  

So we see that the average decreases. It lessens by  233.11 - 213.54 = 19.57.

Correct answer A.

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