Monday Test:

A sample of 10 students selected from those taking a statistics exam obtained the following marks out of a maximum of 100:

58, 59, 59, 60, 61, 62, 62, 63, 65

Thursday Test:

A sample of 10 students selected from those taking a statistics exam obtained the following marks out of a maximum of 100:

58, 87, 52, 62, 67, 62, 52, 73, 75

Calculate the variance and standard deviation for Monday and Thursday tests (separately). What does the standard deviation tell us about the test scores from Monday and Thursday?