Question

Y = constant X1,X2,X3~N(mu,sigma^2) P(X1>Y AND X1+X2>2Y AND X1+X2+X3>3Y) = ?

Y = constant
X1,X2,X3~N(mu,sigma^2)

P(X1>Y AND X1+X2>2Y AND X1+X2+X3>3Y) = ?

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