One morning Emily recorded the time that it took to read each of her e-mail messages. The times, in seconds,

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One morning Emily recorded the time that it took to read each of her e-mail messages. The times, in seconds,

by BTGmoderatorDC » Wed Nov 09, 2022 10:07 pm

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One morning Emily recorded the time that it took to read each of her e-mail messages. The times, in seconds, were 32, 18, 20, 29, and 21. How many seconds greater was the average (arithmetic mean) time than the median time?

A. 1
B. 1.5
C. 2.2
D. 2.5
E. 3

OA E

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Re: One morning Emily recorded the time that it took to read each of her e-mail messages. The times, in seconds,

by [email protected] » Thu Nov 10, 2022 5:46 pm
BTGmoderatorDC wrote:
Wed Nov 09, 2022 10:07 pm
One morning Emily recorded the time that it took to read each of her e-mail messages. The times, in seconds, were 32, 18, 20, 29, and 21. How many seconds greater was the average (arithmetic mean) time than the median time?

A. 1
B. 1.5
C. 2.2
D. 2.5
E. 3

OA E

Source: GMAT Prep
Solution:

The average is:

(32 +18 + 20 + 29 + 21)/5 = 120/5 = 24

The 5 values in order are: 18, 20, 21, 29, 32. Thus, the median is 21.

Therefore, the average is 24 - 21 = 3 seconds more than the median.