N= 23 h0: σ2 ≥ 66 s2 = 60 ha: σ2 < 66 the null hypothesis

a. should not be rejected
b. should be rejected
c. should be revised
d. none of these answers are correct.

Abag contains 3 red marbles 4 white marbles and 5 blue marbles if one marble is drawn from the bag what is the probability that the marble will be blue

Y=(x+3)(x-4)(x+1)^2 sulutions? multiplicity?

60 musicians applied for a job at a music school. 14 of the musicians play both guitar and drums, 28 play drums, 18 play the guitar. what is the probability that the applicant who gets the job plays drums or guitar?