Charlotte and Emily measured the pulse rates of everyone in their class in beats per minute and

Question:

Charlotte and Emily measured the pulse rates of everyone in their class in beats per minute and collected this set of data.
{62, 68, 68, 70, 74, 66, 82, 74, 76, 72, 70, 68, 80,
60, 84, 72, 66, 78, 70, 68, 66, 82, 76, 66, 66, 80}
a. What is the mean pulse rate for the class?
b. What is the standard deviation? What does this tell you?