19. Find the raw scores that cut-off the most extreme 5% under the normal distribution's curve that has a mean of 12 and standard deviation of 3.5. a. +1.96 b. 5.14 and 18.86 O c. +1.645 O d. 6.24 and 17.76 Topic covered in 4.2 | Report a problem 20. Find Xc such that P(x > xc) = 0.09, where x ~ N(15, 2.72)