The weights of 100 7th graders are shown in the table below:
Weights in Pounds 71 - 80 81 - 90 91 - 100 101 - 110 111 - 120
Number of Students
14 27 43
10
6
What is the cumulative frequency of students weighing less than 111 pounds?
OA.
10
OB.
90
OC. 100
OD. 57

(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.)