I have the question and the last answer, but I fail to solve the problem....could any one help me to find the steps???
question and answer are in pictures below...

Question

I have the question and the last answer, but I fail to solve the problem....could any one help me to find the steps???
question and answer are in pictures below...

anonymous · Answer

attachment

koikkara · Answer

For me, It takes time to explain ! Well, I think she can probably help This out !
@Preetha

loser66 · Answer

let @dan815  helps

dan815 · Answer

im not sure i remember deviation for these king i think it might just be Root mean or something

dan815 · Answer

oh sorry cumulative is integral p*f(p)dp

dan815 · Answer

the mean is that /area

dan815 · Answer

prob of less than 12= do over interval 0 to 12 integral (f(p))dp

dan815 · Answer

replace all p with t, in your case since probability is a function of time and its distribution is a function of time

dan815 · Answer

variance is square of how much you are away from the mean , is that righ kirby

kirbykirby · Answer

sorry above I forgot to carry the square root over the integrals.. the integral itself is just the variance, so taking the square root of that will be the standard deviation

dan815 · Answer

i wonder if this works tell me if i got the meaning of variance right

dan815 · Answer

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