Question 1 A sample of size 20 was collected to be used for estimating the mean and variance of a Not yet answered population. A summary of the results is given as _x =250, and _ x2=3213.2 Marked out of 1.00 An unbiased estimate of the population variance is: Flag question O a. 2.15 O b. 4.41 O c. 4.64 O d. 2.1 Question 2 Given the data set: 4.1, 0.4, 1.3, 3.9, 8.6, 6.4, 7.2, 2.8, 1.3, 0.8, the median is: Not yet answered O a. 3.9 Marked out of 1.00 O b. 2.8 Flag question O c. 3.29 O d. 3.35