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geforce

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A client bought two tablets from A1 Computer. If both of them are good, things are fine.

If the client gets one defective machine, A1 Computer will replace it and give a $100 rebate

to the client. If the clients gets two defective machines, A1 Computer will replace both of

them and give a $1000 rebate to the client. What is the expected value and the standard

deviation of the company's rebate?

P(R) = 4/15 x 100 = 26.6%

Since there were 4 defective machines then 2 x 1000 = 2000 was given away to client(s)

so value = 2000

how would I find the standard deviation? I know the usual formula but where would i plug into it?