题目

I had arrived at the airport about 30 minutes before the check­in. It had been a very  __16__  three days for me with lots of meetings. So I was glad to have the  __17__  time to make my notes on what I  __18__  to do the following day. But then came the __19__  that my flight had to be __20__  because there was a problem with the plane. As I sat waiting for my  __21__  to be called, I reflected on my last meeting of the day. It was not a business meeting but rather a very enjoyable  __22__  with an old business friend I had not seen for over 12 years. Our lunch was spent （本小题12分）做投掷2颗骰子的试验，用（x，y）表示结果，其中x表示第1颗骰子出现的点数，y 表示第2颗骰子出现的点数，写出：    （1）求事件“出现点数相等”的概率   （2）求事件“出现点数之和大于8”的概率。