说明：  HistRate(x)，统计数组 x 中的元素出现的频数、频率和累积频率，以表格形式显示在屏幕上。 该函数比tabulate函数的效率高。
(The frequency, frequency, and cumulative frequency of the elements in array x are tabulated on the screen. This function is more efficient than the tabulate function.)