Calculate the expected number of bad checks the grocery

In the table below x = number of bad checks and P(x) is the P that x bad checks will be passed in a week.

x	0	1	2	3	4
P(x)	0.3	0.3	0.2	0.1	0.1

a, calculate the expected number of bad checks the grocery chain will get in one week.

b. calculate the sandard deviation for the # of bad checks.

c. what is the P that 2 or more bad checks will be passed in one week?

d. what is the P that no bad checks will be passed in a week?

Please show all work in obtaining solution

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