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# Edexcel Statistics GCSE question !!

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1. Hey guys how would you do this question ?
1. At regular intervals a sample of 10 packets is taken from the machine.The sample mean is calculated.The sample means are normally distributed with a mean of 1520g and a standard deviation of 4g. Between what limits would you expect 95% of the sample means to lie ?

Thanks
2. At GCSEs I assume that you just need to know that 95% of a normally distributed sample lies within 2 standard deviations of the mean. Which in this cases is within 8g of 1520 which is from 1512 to 1528.

At a-level you are expected to be able to use stats tables. But I think my first paragraph is all you need.
3. (Original post by nerak99)
At GCSEs I assume that you just need to know that 95% of a normally distributed sample lies within 2 standard deviations of the mean. Which in this cases is within 8g of 1520 which is from 1512 to 1528.

At a-level you are expected to be able to use stats tables. But I think my first paragraph is all you need.
Oh thank you

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