Tyler bought 20 shares of wal-mart at $48.80. a year later, he bought 20 more shares at $54.60. he later sold all of his shares at the price of $62.80. tyler's broker charges him 3% of each share as a transaction fee. after all of his transactions, how much money did tyler make?

(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.)