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Posted by **Rebecca** on Sunday, June 5, 2011 at 10:53am.

standard error 0.008kg.The mean is 1.0042kg.Standard deviation is 0.042kg Choose the option that is closest to the

probability, to three decimal places, that the mean weight of the

contents of samples of 30 bags of sugar will be 1kg or more.

Options for Question

A 0.700 B 0.800 C 0.824

D 0.858 E 0.887 F 0.932

- maths -
**PsyDAG**, Sunday, June 5, 2011 at 11:40amZ = (mean1 - mean2)/standard error (SE) of difference between means

SEdiff = √(SEmean1^2 + SEmean2^2)

SEm = SD/√(n-1)

If only one SD is provided, you can use just that to determine SEdiff.

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to that Z score.

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