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 KCPE revision questions and answers on the median

The mean mark of the scores obtained by ten pupils in a test was 12.The marks obtained by eight of the pupil was13,11,10,9,10,18,11,10
If the two obtained equal marks what was the median mark in the test
A. 10
B. 10.5
C. 11
D. 14

 (8m 13s)
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