0.4 squared, or 0.4 squared, is 0.16. So let me do this. So this value right here is going to be 0.16. Let me get my calculator out to actually calculate these values. Let me get my calculator out. So this is going to be 0.4 times 0.36 plus 0.6 times 0.16, which is equal to 0.24. So our standard deviation of this distribution is 0.24.