The Robinsón's electric bills for the last five months have been $157.60, $182.09, $175.15, $166.27, and $162.04. Find the average of the bill. (To find the average, divide the sum by the number of addends.) -What does the sentence in the parentheses mean? do you have to find it by adding all the addends that equals to the number, then divide it by the sum?

Yes.

Add the bills. Then divide by 5 to find the average.

I'll be glad to check your answer.

I added it, it was equal to $843.15, and when i divided it, the exact anser is... $168.63.

in other words it wants you to find the average which is

average = add all sums /number of sums
this is how you will get your average.
average=157.60+182.09+175.15+166.27+162.04/5
=843.15/5
=168.63
so your answer is $168.63

Yes, you are correct. To find the average, you need to add up all the individual amounts (addends) and then divide the sum by the total number of addends. In this case, the addends are the five monthly electric bills: $157.60, $182.09, $175.15, $166.27, and $162.04.

To find the average, you would add up all these amounts:
$157.60 + $182.09 + $175.15 + $166.27 + $162.04 = $843.15

Then, you divide the sum ($843.15) by the number of addends (5):

$843.15 ÷ 5 = $168.63

Therefore, the average electric bill for the last five months is $168.63.