Then she calculated the margin of error and found that the true percentage of dead bacteria is most likely to be above 90%. So what's happening over here, she's trying to figure out what percentage of the total population of bacteria died. And maybe there's something about this bacteria, maybe just when you look at it from the naked eye, you can't tell whether the bacteria died or not. And so she decides to estimate the true percentage by sampling 300 individual bacterium, or I always forget the singular case, by sampling 300 bacteria. And then in her sample, she found that 94% of them were dead and then the margin of error tells us, because the margin of error says that it's unlikely, or that it's very likely that the true percentage is above 90%, that means that given that you sampled 300 bacteria, it's very unlikely that the true percentage is below 90%. So she could feel reasonably confident that in her Petri dish, more than 90% of the population did indeed die. Now let's answer these questions.