E (stock) = 4 * 0.5-2 * 0.5 = 1 ten thousand yuan.

E (fund) = 2 * 0.6-1* 0.2+0 * 0.2 =1ten thousand yuan.

E (savings) =10 *1.04 *1.05-/kloc-0 = 0.92 million yuan or10 *1.04 =/kloc-0.

Calculated variance

D(X)=E(X^2)-(EX)^2

D (inventory) = 10

D (funds) =2.6

So it is safer to choose a fund.