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A medical study followed 13 heart patients who had received electronic pacemakers. The time in ( months ) to the first electrical malfunction was recorded.

A medical study followed 13 heart patients who had received electronic pacemakers. The time in ( months ) to the first electrical malfunction was recorded. 12 22 18 14 3 15 8 18 28 5 10 20 28 Assume the population is normally distributed ( Round your answers to the nearest thousandth )

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