Question 15, 2.4.51 HW Score: 64.71%, 11 of 17 points Save Homework: Section 2.4 Homework Part 1 of 2 O Points: 0 of 1 You used SS, = E(x-x) "when calculating variance and standard deviation. An alternative formula for the standard deviation that is sometimes convenient for hand calculations is shown below. You can find the sample variance by dividing the sum of squares by n - 1, and the sample standard deviation by finding the square root of the sample variance. Complete parts (a) and (b) below. (Xx) SS, = EX2 n Click the icon for a table of the ages (in years) of shoppers at a local store. (a) Use the shortcut formula to calculate the sample standard deviation. - X Data table s = (Simplify your answer. Round to one decimal place as needed.) Shoppers' Ages 18 16 19 20 15 17 17 20 16 14 20 18 22 15 14 14 15 19 19 15 Print Done