# Question: a class sat a test which was graded out of...

###### Question details

A class sat a test which was graded out of 40. This results are:

21 , 31 ,35 ,29

SD=√(-)^2+(a-b)^2+(-)^2+(-)^2

-this is the formula required for standard deviation

-using 4 scores samples,

-if you're using the above formula to manually calculate the sample standard deviation:

1. what numerical value would you substitute for the variable a in a equation above?

2. What numerical value would you substitute for the variable b in the equation above?

3. What numerical value would you substitute for the variable c in the equation above?

NOTE: input your answers as whole numbers with no units or symbols.

DO IT ASAP.

WITH SOLUTIONS.