Math Is Fun Forum

mrcode

Member

Registered: 2011-03-17

Posts: 1

Probability of an Item - Need help! Please

The lifetime of an ipod battery has a right-skewed distribution with a mean of 4,000 hours and standard deviation of 1,000 hours.  If you sample 75 ipod batteries, what is the probability that the sample mean is greater than 4200 hours?

Please show work and answer.

Thanks.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Probability of an Item - Need help! Please

Hi mrcode;

The only thing I can say about a right skewed distribution is that the tail is on the right. In this case you can not have lifetimes less than 0 so it logical for this to right skewed.

But since I do not have PDF or any means to measure the skewness, I am unable to compute the probabilities.

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