Big I: Thee individuals with scores 4, 6, 8 the estimated population variance is?
the mean value is (4+6+8)/3 = 6
the sum of squared differences is (4-6)
2+(6-6)
2+(8-6)
2 = 8
the estimated population variance is given by sum of squared differences divided by n-1 where n is the number of terms (3 here) if this is just a sample from the population. If these three numbers constitute the whole population then replace n-1 by n.
+33616 
