Question 15 (Mandatory) (2 points) If the variance of a sample is 3.5 and the sample size is 10, what is the standard deviation of the sample? O 35 045 cannot determine 0.35 127 Question 16 (Mandatory) (4 points) The normal monthly precipitation (in inches) of 12 selected cities are given blow. 48 2.6 15 1.3 1.8 3.3 5.1 1.1 18 2.5 2.2 3.4 Find the 40th percentile. 22 1.88 2.55 0 3.3 Question 17 (Mandatory) (2 points) The weight (Ibs) of 9 children are given below: 78 02 86 80 92 80 97 85 91 Find the 20th percentile O 84