stat既問題!!!!!!!!急!!!!!!!!!

1 Suppose there is a school with 60% boys and 40% girls as students. Half of the female students and 20% of the male students have blonde hairs. An observer sees a (random) student from a distance; all the observer can see is that this student has blonde hair. What is the probability this student is a girl?

2 According to previous record, school closes on the average 4 days per year due to bad weather such as flood or hurricane. This year school has already closed 1 day due to a rain storm. What is the probability that school will close more than 4 days due to bad weather this year?