The following data are measurements of direct solar intensity (in watts / m2) carried out on different days in the southern Spanish town:

562, 869, 708, 775, 775, 704, 809, 856,

655, 806, 878, 909, 918, 562, 768, 870,

918, 940, 946, 661, 820, 898, 935, 952,

957, 693, 835, 905, 939, 955, 960, 498,

653, 730, and 753.

Calculate the sample mean and the sample standard deviation