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Expectation value

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With probabiliies p1, p2, p3, ¡¦, pk corresponding to probability variables a1, a2, a3, ¡¦, ak,

the expectation value Vp is:

Vp = a1p1 + a2p2 + a3p3 + ¡¦ + akpk = ¥Òakpk

For example, in a lot drawing out of 100 lots, with one first place winner for 1000$, ten second place winners for 100$ each,
the expectation for one chance of drawing is :

Vp = 1000*1/100 + 100*10/100 = 20 ($)


*** Âü°í¹®Çå[References] ***

Vp = a1*p1+a2*p2+a3*p3+a4*p4+a5*p5
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