Stat help please

I need help with the following problem please, i did show my effort bellow;

21% of American children under the age of six live in household with incomes less than the official poverty level. a study chooses 200 children

1) what is the standard od deviation:

root of ; 42( 1-0.21)= 5.75

or 81.46 using my calculator

2)what is the probability that at leat 60 children in the study live in poverty

0.5966 or 59.66%

I would appreciate any input.

thank you