统计学好的同学帮我看看这几道题吧！！着急啊

Question

1. A manufacturer of aspirin claims that the proportion of headache sufferers who get relief with just two aspirins is 62.1%. What is the probability that in a random sample of 420 headache sufferers, less than 58.5% obtain relief?
2. A psychologist believes that 81% of male drivers when lost continue to drive, hoping to find the location they seek rather than ask directions. To examine this belief, he took a random sample of 44 male drivers and asked each what they did when lost. If the belief is true, determine the probability that less than 70% said they continue driving.
3. The proportion of eligible voters in the next election who will vote for the incumbent is assumed to be 52%. What is the probability that in a random sample of 480 voters, less than 49.5% say they will vote for the incumbent?

Answer 1

1. A manufacturer of aspirin claims that the proportion of headache sufferers who get relief with just two aspirins is 62.1%. What is the probability that in a random sample of 420 headache sufferers, less than 58.5% obtain relief?
2. A psychologist believes that 81% of male drivers when lost continue to drive, hoping to find the location they seek rather than ask directions. To examine this belief, he took a random sample of 44 male drivers and asked each what they did when lost. If the belief is true, determine the probability that less than 70% said they continue driving.
3. The proportion of eligible voters in the next election who will vote for the incumbent is assumed to be 52%. What is the probability that in a random sample of 480 voters, less than 49.5% say they will vote for the incumbent? 看不懂啊