1/ Women's heights are normally distributed with a mean of 63.6 inches and a standard deviation of 2.5 inches. If one woman is selected at random, what is the probability that her height is between 62 inches and 64 inches?

2/Women's heights are normally distributed with a mean of 63.6 inches and a standard deviation of 2.5 inches. If 36 women are randomly selected, what is the probability that their mean height between 62 inches and 64 inches?

3/ A survey of 420 women showed that 30% of them purchase books online. Create a 95% confidence interval for the percentage of all women who purchase books online.