in a particular statistics exam, the 35th percentile of final exam score is 42, and the 70th percentile of final exam score is 76. a histogram of the scores approximately follows the normal curve. what is the approximate standard deviation of the final exam scores? hints: what is the z value in the normal table that gives you closest to 35% of the area between -z and z? now what does that tell you about the number of sds in between 42 inches and 76 inches? you might find it helpful to draw a picture of the normal curve with original units and standard units. group of answer choices A. 7.5 B. 37.8 C. 13.1 D. 20.7