The probability that one does not graduate is 0.43 (1.00 - 0.57 = 0.43.)
The probability that all 8 do not graduate is 0.438 = 0.0012.
Either all eight graduate or at most seven graduate.
So the probability that at most seven graduate is 1.0000 - probability that all eight graduate.
The probability that all eight graduate is 0.578 = 0.0111.
So the probability that at most seven will graduate is 1.0000 - 0.1111 = 0.9889.