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Last year members of a certain professional association for environmental scientists consisted of scientists from 62 different local chapters, with an average (arithmetic mean) of 11.7 research stations per chapter. Last year the average number of scientists at these stations who were members of the association was 25 . Which of the following is closest to the total number of members of the association last year?

Explanation	Calculations	Help
$We translate the counts into the multiplication of the number of chapters, the average number of research stations per chapter, and the average number of scientists per station.$	$C = 62 R = 11.7 S = 25 T o t a l = C \times R \times S$
$Because the answer choices differ by orders of magnitude, we use rough estimation to simplify the multiplication.$	$62 \approx 60 11.7 \approx 10 25 \approx 25$	Theory & Tactics Method Card CALC1-B Click to view full details
$We multiply the approximate values to get the estimated total number of members.$	$60 \times 10 \times 25 = 600 \times 25 = 15000$

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D

Last year members of a certain professional association for environmental scientists consisted of scientists from 62 different local chapters, with an average (arithmetic mean) of 11.7 research stations per chapter. Last year the average number of scientists at these stations who were members of the association was 25 . Which of the following is closest to the total number of members of the association last year?

Explanation	Calculations	Help
$We translate the counts into the multiplication of the number of chapters, the average number of research stations per chapter, and the average number of scientists per station.$	$C = 62 R = 11.7 S = 25 T o t a l = C \times R \times S$
$Because the answer choices differ by orders of magnitude, we use rough estimation to simplify the multiplication.$	$62 \approx 60 11.7 \approx 10 25 \approx 25$	Theory & Tactics Method Card CALC1-B Click to view full details
$We multiply the approximate values to get the estimated total number of members.$	$60 \times 10 \times 25 = 600 \times 25 = 15000$

Scroll horizontally to view all columns

D