This is an example of binomial probability (pass/fail), with n=8 and p(failure)=0.3.
The probability that none will fail is binompdf(8,0.3,0) = 0.0576. The prob. that all will fail is found by subtracting this result from 1.0000, and is 1.0000-0.0576=0.9424. "All" is the "complement" of "None."
I used my TI-83 Plus calculator's probability distribution functions to calculate the probability that none will fail.