Question: (a) The numbers x1, x2, . . . , xn and y1, y2, . . . , yn are random observations from the same exponential

(a) The numbers x1, x2, . . . , xn and y1, y2, . . . , yn are random observations from the same exponential distribution.
(b) The average of x1, x2, . . . , xn is equal to the average of y1, y2, . . . , yn.
(c) z is a random observation from an Erlang (gamma) distribution.

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