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एक यादृच्छिक चर X का निम्नलिखित प्रायिकता बंटन है :
`{:(X,0,1,2,3,4,5,6,7,8),(P(X=x),a,3a,5a,7a,9a,11a,13a,15a,17a):}`
a का मान ज्ञात करें

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चूँकि किसी प्रायिकता बंटन में सभी प्रायिकताओं का योगफल 1 (इकाई) होता है।
`therefore SigmaP(X)=1`
`implies P(X=0)+P(X=1)+...+P(X=8)=1`
`implies a+3a+5a+...+17a=1`
`implies(9)/(2).[2a+(9-1).2a]=1` [A.P. का योगफल]
`implies (9)/(2).18a=1`
`implies a=(1)/(81)`

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