A temperature sensor has mean reading 40 °C with SD 5 °C. Any reading more than 2 SDs away from the mean is flagged. Which reading below would be flagged?

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51 °C. The safe band is 40±10, i.e. 30 to 50 °C. Only 51 °C lies outside it (z = 2.2). 31 °C is inside (z = −1.8).

A temperature sensor has mean reading 40 °C with SD 5 °C. Any reading more than 2 SDs away from the mean is flagged. Which reading below would be flagged?

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