Exp. (d)Statement II is true because they are standard formulae.Statement I Sum of n even natural numbers=n(n+1)⇒ Mean (xˉ)=nn(n+1)​=n+1∴ Variance =[n1​∑(xi​)2]−(xˉ)2=n1​[22+42+…+(2n)2]−(n+1)2=n1​22[12+22+…+n2]−(n+1)2=n4​6n(n+1)(2n+1)​−(n+1)2=3(n+1)[2(2n+1)−3(n+1)]​=3(n+1)(n−1)​=3n2−1​Hence, Statement I is false.