Mprashawn recently spent $100 to open a store selling tee-shirts. at his business, he purchases plain tee-shirts for $11 each, prints graphics on them, and then sells them for $26 each. what is the minimum number of tee-shirts that rashawn would need to sell in order to make a profit (total income minus total expenses) of at least $400?

(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.)