4. For the list of numbers {38, 46, 45, 50, 52, 54, 58, 55,57), find the average and stan- dard deviation. You must do your computation by hand (you can use your calculator
to add, subtract, multiply, divide and do powers and roots, but you have to write
down what you compute and you cannot use an avg/SD property of a calculator to
compute them), and you must show all steps to receive full credit. It is best to or-
ganize everything into a table. How many numbers are within 1 SD of the average?
2 SD?