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Question

The mean and median of the numbers 1, 2, 3,4, y, 8, 9, 10, 12 and x written in increasing order are both 10, then the values of x and y are _____.

A
x=15,y=36
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B
x=39,y=12
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C
x=15,y=36
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D
x=39,y=15
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Solution

The correct option is B x=39,y=12
Given numbers are 1, 2, 3,4, y, 8, 9, 10, 12 and x.
Mean=xiN10=1+2+3+4+y+8+9+10+12+x10100=49+x+yx+y=51
and median=(n2)th observation+(n2+1)th observation210=y+8220=y+8y=12 x=5112
=39
x=39,y=12

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