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# GCSE Statistics Watch

1. Anyone know where I can get mark schemes for Edexcel GCSE Past Papers (pre 2011). 1389 1H series? I have the exam papers but can't find any mark schemes for 2004-2010. TIA
2. try freeexampapers.com ? they have it for some of them, like 2007, but a few are missing
3. Thank you for that.
2008, 2009 and 2010 were there, so I will concentrate on those and forget 2004-2007, which only have the examiners report.
4. 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
5. 95% means that the limits are 2 standard deviations up and down from the mean. this means -

1520 + (4 x 2) = 1528g
1520 - (4 x 2) = 1512g

so the limits would be 1512g - 1528g

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