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integration problem

hi guys, im totally clueless on this question. ive googled a similar question and it says the limits are 9pi and 0, but you also have to multiply the integrand by x. i think i know why the limits are 9pi and 0 but multiplying the integrand by x really confuses me. could anyone please shed some light on that?
thanks in advance:biggrin:
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Original post by kingsclub
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The mean or expectation of a continuous random variable is ∫xf(x)  dx\int x f(x)\;dx.
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kingsclub
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Original post by ghostwalker
The mean or expectation of a continuous random variable is ∫xf(x)  dx\int x f(x)\;dx.


oh my god, don't think we've learnt anything like that:frown: at first, i thought we should be using the formula: integrand/(b-a), where b and a are the limits...
Explanation here.

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