So on this side, you've got a number -- you've done it lots of times, so you get it accurately -- which is the average number of tosses until head-tail-tail.
那么 这半边的观众得出了一个平均数 因为做了很多次 所以这个数字是准确的 就是正反反情形出现时投掷硬币次数的平均