Hello, I have some doubts with statistics functions

I have the following exercise:

-10% of Profit, Prob 15%

1% of Profit, Prob 50%

6% of Profit, Prob 35%

After I enter the data:

a) I set in 2nd Stat.

b) I set in 1-v

c) Aparece “Error 4”

Why?

Regards