if the moment-generating function of X is
Mx(t)=1/5+1/5 *e^(20t)+2/5*e(300t)+1/5*e(-t)
find the p.d.f of X
Ans:
由m.g.f之唯一性得知,
X=x -1 0 20 300
fx(x) 1/5 1/5 1/5 2/5
應該很基礎但小弟不懂
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