ʶԵͧ (Ѹ)





մӡѴҧ = ҹ·شͧѹҤ鹹 + ҷҡشͧѹҤ鹷ӡ˹觪2



մӡѴ = ҷҡشͧѹҤ鹹 + ҷ·شͧѹҤ鹷٧˹觪2



ҧͧѹҤ = մӡѴ - մӡѴҧ


ش觡ҧ = մӡѴҧ + մӡѴ2



ش觡ҧ = ҷ·شͧѹҤ + ҷҡشͧѹҤ2




= մӡѴͧѹҤ٧اʴ - մӡѴҧͧѹҤ鹵ش

    = ṹ٧ش - ṹش

ӹǹѹҤ = ҧͧѹҤ



ŢԵ ( x )
=
(͢ᨡᨧ)
∑x źǡͧṹ
N ӹǹ
x
=
(͢ᨧᨧ)
∑fx źǡͧŤٳҧṹѺ
N ӹǹ


Ѹ°ҹ
ҡҧͧ §Ũҡҡ §ҡҡ仹
ҨӹǹŢ 2 ҡҧҤ


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