A recent study reported that the prevalence of hyperlipidemia is 30% in children. If 12 children were apart of this study, what is the probability that three are hyperlipidemia?

Is it unusual because the probability of a women having blood pressure lower than 63 mmhg is what?

Suppose that asthma affects 1 in 20 children in a population. We decide to redo the survey and now take an SRS of 250 children from this population. What is the probability of observing at least 25 cases in a sample?

Suppose that asthma affects 1 in 20 children in a population. You take an SRS of 50 children from this population. What is the probability of observing at least five cases in a sample?

If the population proportion is 0.90 and a sample of size 64 is taken, what is the probability that the sample proportion is less than 0.88?

please help.  thank you

If 33 live births per 1,000 per year result in twins, what is the probability of getting more than 0.15% twins per year in a random sample of 450 live births?

An experiemental drug has been shown to be 75% effective in eliminating symptoms of allergies in animals studies. A small human study involve 6 participants is conducted. What is the probability that the drug is effective on half of the participants

Sixty percent of clowns aren’t funny.   If you randomly encounter three different clowns, what is the probability that none of them are funny?

Apparently, depression significantly increases the risk of developing dementia later in lift (BBC News, July 6, 2010). In a recent study it was reported that 22% of those who had depression went on to develop dementia, compared to only 17% of those who did not have depression. Suppose 10% of all people suffer from depression.   What is the probability of a person developing dementia?   If a person has developed dementia, what is the probability that the person suffered from depression earlier in life?