Derek has a jar of marbles-half are red and half are blue. the red marbles are slightly smaller than the blue marbles. derek assumes that because the jar contains the same number of marbles of each color, if he closes his eyes and picks a marble, he will draw a red marble 50% of the time. is derek correct? why or why not?

Which equation matches the graph shown ?

The table shows the number of students who signed up for different after school activities. activity students cooking 9 chess 4 photography 8 robotics 11 select the true statements about the information in the table.

(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.)