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Asalor
@Asalor
September 2021
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Найти P2, математическое ожидание и дисперсию данной случайной величины X.
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krosochka
P2 = 1 - p1 = 0,8
MX = x1*p1 + x2*p2 = 1*0,2 + 2*0,8 = 1,8
DX = M(x^2) -
(MX)^2
= x1^2*p1 + x2^2*p2 - (MX)^2 = 1*0,2 + 4*0,8 - 1,8^2 = 3,4 - 3,24 = 0,16
2 votes
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Answers & Comments
MX = x1*p1 + x2*p2 = 1*0,2 + 2*0,8 = 1,8
DX = M(x^2) - (MX)^2 = x1^2*p1 + x2^2*p2 - (MX)^2 = 1*0,2 + 4*0,8 - 1,8^2 = 3,4 - 3,24 = 0,16