12) A college instructor has determined that the mean time it takes all the students to complete the final exam is u = 92.5 minutes and o= 17.6 minutes. Determine the mean and standard error of the sampling distribution of the mean if n= 144 ( 2 decimal places) O au- = 93 and of = 17.6 Ob.H- = 92 and of = 144 O c.My = 92.5 and Ox = 1.47 O d. none of the choices