Steve and his daughter went on 30- mile backpacking trek in yosemite national park. they hiked 7.7 mi the first day , 6.4 the second day and 8.0 mi the third day. how much farther did they have to go ?

(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.)