Mean & Variance of a Probability distribution
A bank keeps tracks of customers coming into the bank between 12 Noon and1 PM on Monday. The probability distribution for customer arrivals can be represented by the following table:
X (number of customers) p(x), probability of x
0 0.1
1 0.15
2 0.18
3 0.2
4 0.2
5 0.1
6 0.07
Find the average and the standard deviation of the customers coming into the bank on a Monday between 12 Noon and 1 PM?