Recent content by CryptoMath

I just got the correct answer: I had 60 because I was thinking we needed to total amount of microprocessor Step 1: Binomcdf(4,0.095,0,1) =0.9524 Step2: Variance formula for Binomial = npq with n = 15 and p = 0.9524 and q = (1-0.9524) =0.679136

Okay; Step 1: 15*4=60 Binomcdf(60,0.095,0,1) =0.018287 Step2: Variance formula for Binomial = npq with n = 15 and p = 0.018287 and q = (1-0.018287) = 0.269287

I did that: Binomcdf(15,0.095,0,1) =0.576018 Variance formula for Binomial = npq with n = 4 and p = 0.576018 and q = (1-0.576018) = 0.976885 Does that make sense ? Thank you for your help and time.

https://www.physicsforums.com/threads/math-probability-need-to-find-the-variance.857348/

Homework Statement You buy 15 boxes each containing 4 microprocessors. All microprocessors come from a very large lot in which 9.5 % of microprocessors are defective. Y = the number of boxes in which there is less than 2 defective microprocessors. QUESTION: Find the Variance of the variable Y...

I have an other exercise, may you help me with that one please ?

I got this one resolved it is simply that: Variance/n = 0.852/14 =0.060208, this is the answer. Checked in my book to confirm :)

[FONT=PT Sans]Average_Total: as in the average of all the 14 plums. Variance/n : To have the average variance I believe as this is what its asking in the problem X= the average weight of plums in a pack of 14 plums. and I need to find the variance. But what distribution do I have to follow...

Homework Statement Weight of the plums of a large lot is averaging 70 g and SD 0.85 g. X= the average weight of plums in a pack of 14 plums. Find the variance of the variable X. Homework EquationsThe Attempt at a Solution n=14 Average_Total= 70*14=980 SD2 = Variance_Total= 0.852 *12 = 10.115...

I got this resolved by doing poissPdf(0.4,0) =p n = 112 variance with binomial = n*p*q and its correct answer :)

Homework Statement I need to find the variance of Y. The number of errors on a page follows a Poisson distribution with lambda = 0.40 average . Y = the number of pages without error among the first 112 pages . Homework EquationsThe Attempt at a Solution In Poisson, I know that Variance =...