a) It is known that the standard deviation for a set of data is 3.6. Find the variance for the dat b) If the lowest value in a set of data is 54, and the range for the same data is 33, find the high the set. [1 mark] c) Adult IQ scores have a bell-shaped distribution with a mean of 120 and a standard deviation the empirical rule to find the percentage of adults with IQ scores between 80 and 160. Includ with your answer (leave no space between the number and the symbol of percentage). d) Adult IQ scores have a bell-shaped distribution with a mean of 120 and a standard deviatio What IQ score is positioned 1.7 standard deviations below the mean