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According to the table, what is the average (arithmetic mean

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According to the table, what is the average (arithmetic mean [#permalink] New post 26 Nov 2019, 11:30
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According to the table, what is the average (arithmetic mean) hourly wage of the employees at Company C?

A. $12

B. $17

C. $23

D. $25

E. $30


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Re: According to the table, what is the average (arithmetic mean [#permalink] New post 28 Nov 2019, 07:02
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The answer is C.

Average =(30 X 10 +10 X 18 +20 X 25 + 28 X 30 + 12 X 40)/(30+10+20+28+12)
=2300 / 100
=23
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Re: According to the table, what is the average (arithmetic mean [#permalink] New post 02 Dec 2019, 11:03
Any recommendations for doing these kind of excercises faster? I mean, instead of multiplying each row, adding the values and then dividing by the number of workers, is there a faster way to approximate the result??
My gut told me it would be 23, but I don't think I can trust my feelings each time...
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Re: According to the table, what is the average (arithmetic mean [#permalink] New post 02 Dec 2019, 13:00
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What is important here is the number of employees rather the paycheck per hour.

Put them in increasing order

10 - 12 - 20 - 28 - 30

the first two the difference is two. The last two as well.

20 is exactly 8 points from the datum before and the datum after.

We do have a perfect balance. C is the answer.

Hope this helsp
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Re: According to the table, what is the average (arithmetic mean   [#permalink] 02 Dec 2019, 13:00
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