I literally put this in the calculator 5 times and i cannot come up with the right answer. can someone type out exactly how i should put this in my graphing calculator?

s² = (-50% 11.40%)²(0.1) + (-5% 11.40%)²(0.2) + (16% 11.40%)²(0.4)

+ (25% 11.40%)²(0.2) + (60% 11.40%)²(0.1)

s² = 712.44; s = 26.69%.