# Find the mean and standard deviation of the sum or difference of independent random v

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• December 9th 2012, 11:30 AM
asilvester635
Find the mean and standard deviation of the sum or difference of independent random v
what should i do for A?? and for B, is it asking me to convert all the temperatures to Fahrenheit?
• December 10th 2012, 03:17 PM
ANDS!
Re: Find the mean and standard deviation of the sum or difference of independent rand
They are asking for $E[X-550]$, and $\textrm{Var}(X-550)$. You should have some formulas that should make the preceding quite simple.
• December 10th 2012, 07:09 PM
asilvester635
Re: Find the mean and standard deviation of the sum or difference of independent rand
yes i figured out how to get the mean... i just simply take the temperatures that are off target and minus it to 550... i got that part but what i don't know how to get is the standard deviation.... would you happen to know how to calculate that based on my problem??