Students arrive randomly at the help desk of the computer lab. There is only one service agent, and the time required for inquiry varies from student to student. Arrival rates have been found to follow the Poisson distribution with rate of 12 students per hour, and the service times follow the exponential distribution with rate 20 students per hour. What is the average service time for this problem

Which graph shows a function with a range of all real numbers greater than or equal to -1

Given: pqrs is a parallelogram prove: pr and qs bisect each other at t

(b) suppose that consolidated power decides to use a level of significance of α = .05, and suppose a random sample of 100 temperature readings is obtained. if the sample mean of the 100 temperature readings is x⎯⎯ = 60.990, test h0 versus ha and determine whether the power plant should be shut down and the cooling system repaired. perform the hypothesis test by using a critical value and a p-value. assume σ = 5. (round your z to 2 decimal places and p-value to 4 decimal places.)