business statistics - exercise 7.28 in business statistics in practice?

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number of flaws / probability
per floppy disk
0 / .65
1 / .2
2 / .1
3 / .05

a. calculate the mean and standard deviation of the number of flaws per disk.
b. suppose that we radon select a sample of 100 floppy disks. describe the shape of the sampling distribution of the sample mean x. then compute the mean and standard deviation of the sampling distribution of x.
c. sketch the sampling distribution of the sample mean x and compare it to the distribution describing the number of flaws on a single floppy disk.
d. the supply house managers are worried that the floppy disks being received have an excessive number of flaws. because of this a random sample of 100 disks is drawn from each shipment is sent back to the supplier if the average number of flaws per disk is greater than .75. suppose that the mean number of flaws per disk for this week is actually .55. what is the probability that this shipment will be rejected and sen back to the supplier?

can anyone help me with this problem at all? thanks a million, if possible.
 
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