stats help!

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suppose the number of customer complaints per day on the morning shift (6am-12) at Murph's Coffee is distributed as follows:
Complaints f(x)
0 .3
1 ???
2 .2

a) what is the value of ???

b)what is the average number of complaints per day on the morning shift?

c)what is the standard deviation of the number of complaints per day on the morning shift?

d)if Y is the number of inexperienced staff people at Murph's on the morning shift, would the values of X and Y be correlated? explain

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