# Can someone help me please?

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A set of 50 data values has a mean of 15 and a variance of 25. Find the standard score of a data value = 20

• statistics -

The "standard score" is more commonly called the "z-score".

It is the number of "standard deviations" above the mean.

The standard deviation is the square root of the variance, or 5 in this case.

The number of data values is not needed to answer the question.

A data point of 20 is one standard deviation above the mean of 15, so the standard or "z" score is 1.0

• Can someone help me please? -

Statistics confuses me....thank you for your help :)

• Can someone help me please? -

A z-score is 0.6 standard deviations above the mean.

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Can you step by srep dumb this down so that I can understand how to get the answer please?

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