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How many of the following experiments must be exponential random variables?

i. An experiment which records the time it takes for all $50$ iPhone batteries in a shipment to lose their charge.

ii. An experiment which records the number of full days an iPhone needs without a reset.

iii. An experiment which has probability density function equal to $f(x)=5e^{5x}$ for $x<0$.

iv. An experiment whose outcomes are all positive real numbers.

v. An experiment which measures how long heart-attack patients survive after hospital discharge.

A

0

B

1

C

2

D

3

E

4

F

5

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