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Mean, Median, Deviation
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Question 1
GMAT Problem Solving Practice Questions : Arithmetic Mean
The question for the day is a Math question from the topic Averages.
Question 1
If the mean of numbers 28, x, 42, 78 and 104 is 62, then what is the mean of 128, 255, 511, 1023 and x?
395
275
355
415
365
The correct choice is (A) and the correct answer is
395
.
Explanatory Answer
The average (arithmetic mean) of the 5 numbers 28, x, 42, 78 and 104 is 62.
Therefore, the sum of these 5 numbers is 62 * 5 = 310
i.e., 28 + x + 42 + 78 + 104 = 310
Hence, x = 310 - 252 = 58.
The average of 128, 255, 511, 1023 and x =
= 395
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