Don't put aything down if you don't know what it refers to. Your null hypothesis is correct, although you could also say the mean weight is equal to 32 or MORE. The alternate hypothesis would then be that the mean weight is actually LESS than 32.
When you plugged your values into your calculator, and got your test-statistic of -.6093; then somehow you got a P-Value of 0.5. Do you know this this means? What this is essentially saying is that 50% of the time you would expect to get a mean weight of less than 32. That can not be right. How did you go about letting the calculator computer your P-value for you?