Ms. Smith wants to adjust the scores on the last quiz because she feels the low mean of 64 is a result of giving the quiz before students are ready. If twenty students took the test, what is the new mean after Ms. Smith adds 6 points to each quiz grade?

(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.)