# Question: If the number of minutes it takes a service station

If the number of minutes it takes a service station attendant to balance a tire is a random variable having an exponential distribution with the parameter λ = 5, what are the probabilities that the attendant will take

(a) Less than 8 minutes to balance two tires;

(b) At least 12 minutes to balance three tires?

(a) Less than 8 minutes to balance two tires;

(b) At least 12 minutes to balance three tires?

## Answer to relevant Questions

If the number of minutes that a doctor spends with a patient is a random variable having an exponential distribution with the parameter θ = 9, what are the probabilities that it will take the doctor at least 20 minutes to ...The logarithm of the ratio of the output to the input current of a transistor is called its current gain. If current gain measurements made on a certain transistor are normally distributed with µ = 1.8 and σ = 0.05, find ...If a random sample of size n is selected without replacement from the finite population that consists of the integers 1, 2, . . . , N, show that (a) The mean of is N + 1 / 2; (b) The variance of is (N + 1)(N – n) / ...Verify the identity Which we used in the proof of Theorem 8.11. Use Stirling’s formula of Exercise 1.6 on page 16 to show that when v → ∞, the t distribution approaches the standard normal distribution.Post your question