i want answers for 8,9and 10

8- Which of the following data set has the largest variance: (a) 4,4,4 (b) 2002,2003,2004 (c) 3,4,5 (d) 2,6,10 9- If X follows a Binomial distribution with trials number n and success probability variance is given by the following formula: a) np(1p) b) np c) n(1p) d) p(1p). 10- Let X be a continuous random variable with density function: f(x)={cx3;0;0