1. Find missing value from the following data
`-9,-4,a,5,8,11` and median`=2`

Solution:
Here `-9,-4,a,5,8,11`

`M = (text{value of } (n/2)^(th) text{ observation} + text{value of } (n/2 + 1)^(th) text{ observation})/2`

`2 = (text{value of } (6/2)^(th) text{ observation} + text{value of } (6/2 + 1)^(th) text{ observation})/2`

`2 = (text{value of } 3^(rd) text{ observation} + text{value of } 4^(th) text{ observation})/2`

`2=(a+5)/2`

`4=a+5`

`a=4-5`

`a=-1`

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