Every Normal model is defined by its parameters, the mean and the standard deviation. For each model described below, find the missing parameter. As always, start by drawing a picture. a) =20,25% above 40;=? b) =94,10% below 50;= ? c) =5.5,70% below 120;= ? d) =15.6,35% above 17.9,= ? a) Choose the correct graph below, using the shaded area to represent the area above or below the observed value. A. B. C. D. Find the value of . = (Round to one decimal place as needed)