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31 July, 21:42

The distribution of vitamin C amount in vitamin drops produced by a given factory is approximately Normal, with a mean of 60.0 mg and a standard deviation of 0.5 mg.

About 80% of vitamin drops contain more than

A 59.36 mg of vitamin C.

B 59.58 mg of vitamin C.

C 60.42 mg of vitamin C.

D 60.64 mg of vitamin C.

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Answers (1)
  1. 1 August, 01:40
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    You have to calculate z-scores for each of these values and then compare them with what is needed for the 80%tile on a Normal curve.

    z = (value - mean) / (standard deviation) = (value-60.0) / 0.5.

    z = 1 has 84% of the values smaller.
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