[商管]101政大財管 統計
according to survey data,college stuents carried an average
of$3173 credit debt 2008.Suppose the probability distribution of
the current credit card debt for all college student is known but
its mean is $3173 and the standard devitation is $750
1) find the probability that the credit card debt for a randomly selected
college is between $2109and$3605
想請問各位覺得這題該用柴比雪夫還是該假設為常態分配，標準化來解呢?
我看解答是用柴比雪夫解
p{2109<x<3605}=p{│x-(2109+3605)/2│<= (3605-2109)/2}
>=1-{750^2+[3173-(2109+3605)/2]^2}/[(3605-2109)/2]^2
但我不懂這解法，請大家賜教
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