A) 10
B) 20
C) 30
D) 40
E) None of these
Correct Answer: B
Solution :
Explanation Arranging the given data in ascending order, 11, 15, 13, 27, 19, 24, 20, here \[\operatorname{no}. of observation = 7 \left( odd \right)\] \[\therefore \,median = 19\], when 13 is replaced by 31, the data becomes as follows on arranging in ascending order. 11, 15, 19, 20, 24, 27, 31 \[\therefore \,median = value of {{4}^{th}}observation\] Since 4th observation in new series is 20, new median is 20.
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