Sam is a waiter at a local restaurant where he earns wages of $5 per hour. sam figures that he also earns about $3 in tips for each person he serves. sam works 6 hours on a particular day. if n represents the number of people sam serves that day, which of the following functions could sam use to figure e, his total earnings for the day?

a. e(n) = 3n
b. e(n) = 3n + 30
c. e(n) = 5n + 18

(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.)