x P(x)

Question

0 0.3
1 0.15
2 0.2
3 0.35

Find the standard deviation of this probability distribution. Give your answer to at least 2 decimal places

Answer 1

You want me to find the mean
then the difference of each from the mean
then square that
then add them all and divide by 3 or 4 depending on your class' definition
then take the square root.
No way - You do it.