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10 Feb 2020, 05:05
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
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Nurse Joe recorded the weights of each of the five babies born yesterday. What is the arithmetic mean of the weights of the five babies?
(1) The cumulative weight of the first three babies was 21 pounds.
(2) The cumulative weight of the last three babies was 24 pounds.
(1) The cumulative weight of the first three babies was 21 pounds.
(2) The cumulative weight of the last three babies was 24 pounds.
10 Feb 2020, 14:09
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Bunuel
I'm not sure what the word "cumulative" could mean in either Statement. Assuming they mean the sum of the three weights each time, the answer is E. To find the average of the five weights, we need the sum of the five weights. It's impossible to find that sum using both Statements -- if the third baby weighs 0 pounds, then the sum of the five weights would be 21+24 = 45 pounds. But if the third baby weighs 21 pounds, say, then the sum of the five weights will just be 24 pounds. Of course any sum between 24 and 45 is possible, so the average could be anywhere between 4.8 and 9 pounds.
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