Let Y1, Y2, . . . , Yn be independent, exponentially

Chapter 6, Problem 81E

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QUESTION:

Problem 81E

Let Y1, Y2, . . . , Yn be independent, exponentially distributed random variables with mean β.

a Show that Y(1) = min(Y1, Y2, . . . , Yn ) has an exponential distribution, with mean β/n.

b If n = 5 and β = 2, find P(Y(1) ≤ 3.6).

Questions & Answers

QUESTION:

Problem 81E

Let Y1, Y2, . . . , Yn be independent, exponentially distributed random variables with mean β.

a Show that Y(1) = min(Y1, Y2, . . . , Yn ) has an exponential distribution, with mean β/n.

b If n = 5 and β = 2, find P(Y(1) ≤ 3.6).

ANSWER:

Step 1 of 3

a)

Density function of maximum:

Density function of minimum:

 are exponentially distributed with mean  :

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