Provide an appropriate response. The lengths of pregnancies are normally distributed with a mean of 271 days and a standard deviation of 20 days. If 64 women are randomly selected, find the probability that they have a mean pregnancy between 271 days and 273 days. Round to four decimal places.

Aretha wanted to gather data about the cost of local bowling leagues in her area. she plotted the data and determined that the average bowling league costs consist of a one-time registration fee and a monthly fee modeled by the equation y = 15x + 20. identify and interpret the y-intercept in this model. the y-intercept is 20. this is the cost per month. the y-intercept is 20. this is the cost of registration. the y-intercept is 15. this is the cost of registration. the y-intercept is 15. this is the cost per month.