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OpenStudy (anonymous):
okay can someone help me understand how to do problems like this I'm really confused on some parts What is the standard deviation for the random variable X? x 1 2 3 4 5 P(x) 0.2 0.1 0.1 0.2 0.3 I got (2.3) but that's not the answer there's one more step. Can I get help on the last step?
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