NOR 31. The heights of students at a college are normally distributed with u = 67 inches and O = 2 inches. What is the proportion of students who have heights in the range from why am66.5 to 68 inches? houmnivob bobmate bos atno o tisom rotw (A) 0.5000 (B) 0.2500 to (C) 0.7500mai olod a ovait (D) 0.2902 A ( (E) 0.6915 h mean of 65 andNOR 20 . Refer to the preceding question . What is the approximate 9oth percentile of the mark distribution ?! `ON```COST ( A ) 8011 ( B ) 90 5 ~` ( C ). 85 ib `si` ( D ), 75 NATION ( E ) 95([ ) 1% NOR 36 . What is the 20th percentile of the standard normal distribution ?! ( A ) . 84 ( B ) . 58 ( C ) - . 42 ( D ) -. 84 ([ ) : 20NOR 24 . A mill makes castings containing a hole which is specified to have a diameter of 6 cm . Due to variability in the manufacturing process the actual diameter is a normal variable with mean 6 cm . and standard deviation 0. 25 ( cm ) . The proportion of these castings that have a hole diameter within 1/2 cm of the specification ( 6 cm ) is :`\\\\ ( A ) . 0456 ( B ) . 5000 ( C ) . 9544 ( D ) . 4772 WORD ([ ) . 9772