Posted by **ben** on Saturday, June 11, 2011 at 8:33pm.

The mean weight (1.0042kg) of the contents of samples of 30 bags of sugar has

standard error 0.008kg. 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 12, 2011 at 2:13pm
Z = (mean1 - mean2)/standard error (SE) of difference between means

SEdiff = √(SEmean1^2 + SEmean2^2)

If only one SEm 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 the Z score.

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