Properties of Normal Distribution

Question

For a normally distributed data set with a mean of 70 and a standard deviation of 5, which of the following statements is true?

Accepted Answer

Approximately 95% of the data lie between 60 and 80.

Answer

Approximately 95.5% of the data lie between 55 and 85.

Answer

None of these statements is true.

Answer

Approximately 68% of the data lie between 50 and 90.

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