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Math Help - Normal and Sampling Distribution #2

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    Normal and Sampling Distribution #2

    Please help! I've got nooo idea what to do!

    4. The average and standard deviation of the amount of Goods and Services Tax remitted by all performance artists in a twelve month period were $6.69 thous and $1.67 thous respectively. If a sample of 116 artists was taken, find the average value (in thous dollars) below which only 1% of taxes would lie.

    5. The length of time of long-distance phone calls has a variance of 38.4 minutes squared. It is also known that 7% of calls last longer than 42.4 minutes. Find the mean assuming the distribution closely approximates a normal distribution

    Your help would be muchly appreciated!!
    Last edited by mr fantastic; September 11th 2009 at 07:42 PM. Reason: Questions moved from original thread.
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