Question

The life time of a lamp X follows exp(λ = 1/3 per hour). Hence, on average,...

The life time of a lamp X follows

exp(λ

= 1/3 per hour). Hence, on average, 1

failure per 3 hours.

a) Find the probability that the lamp lasts longer than its mean life.

b) The probability that the lamp lasts between 2 to 3 hours.

c) Find the probability that it lasts for another hour given it is operating for

2.5 hours.

Math   Statistics-And-Probability   
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