Assuming the data are bell shaped, Count how many observations between 2 standard deviation of the mean

12.00 9.00 1.00 16.00 12.00 9.00 7.00 26.00 7.00 33.00 3.00 16.00 41.00 9.00 4.00 38.00 22.00 1.00 5.00 29.00 29.00 26.00 16.00 22.00 33.00 5.00 22.00 12.00 42.00 12.00 33.00 26.00 47.00 38.00 20.00 29.00 33.00 20.00 45.00 33.00 22.00 22.00 45.00 38.00 42.00 29.00 16.00 44.00 48.00 50.00