Asked Oct 26, 2019
Let X1, X2,... , Xn be independent Exp(A) random variables. Let
Y = X(1)min{X1, X2, ... , Xn}. Show that Y follows Exp(nA) dis-
tribution. Hint: Find the pdf of Y

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Let X1, X2,... , Xn be independent Exp(A) random variables. Let Y = X(1)min{X1, X2, ... , Xn}. Show that Y follows Exp(nA) dis- tribution. Hint: Find the pdf of Y


Expert Answer

Step 1


Hey there! Thank you for the question. Although the hint in the question suggests finding the pdf of Y to solve the problem, we have used a different method- the cdf- to solve it. Both ways are correct and possible to use here.

Step 2


Consider an exponential distribution with probability density function (pdf):

f (x) = λ e – λx; x > 0; λ > 0.

The cumulative distribution function (cdf) for this distribution is:

P (Xx) = F (x) = 1 – e – λx; x > 0.

Therefore, the tail function is given as:

P (X > x) = e – λx; x > 0.

Step 3


It is given that Y = X(1) = min {X1, X2, …, Xn}.

Note that, as X1, X2, …, Xn are independent, their joint cdf fill be the product of their individual cdf’s; as a result, their joint tail function would also be the product of their ind...


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F(y) P(YS y) P(X(y) 1-P(Xy) -1-P(X1>y,X > y,...X >y) min X, XX}>y,..each ofX,X,Y must be greater than y -1-[P(x>y) P(X,> y)... P(Xx>y)] 1-(ee-t9 2 2 e9(up to n ternms) =1-ey


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