70% of batteries good 30% bad pick 15 random probability at leat 10 of them are good?

probability thing.... that "at least" thing is hard to understand. or:probability thing.... that \"at least\" thing is hard to understand.or:It's as i

probability thing.... that "at least" thing is hard to understand.

or:probability thing.... that \"at least\" thing is hard to understand.

or:It's as in 70% of 15 are good=10 / 11 are good. This means that 4 / 5 are bad. This means that at least FIVE are good, not 10.

Tags:good,probability,