basic probability question

[davidfsmith]

Probability of 12 defects in one batch = 0.3060

If two more batches are produced, find the probability that all 3 batches will contain at least 12 defects.

I can do all the basic ones on the exercise i'm doing, this one has just stumped me because it uses a decimal value instead of fractions.

[jerryb]

David,

if you use 306/1000 will that help?

cheers
jerry

[davidfsmith]

yep i managed to get it now. Its 153/500 i need to use and the question is easy. Thanks jerryb for pointing me in the right direction.