Daytime high temperatures in New York in February are normally distributed with an average of 30.2º and a standard deviation of 8.5º.Estimate the probability that the temperature on a given day in February is 22º or lower.

Convert 22º to a z-score: z = (22 − 30.2) / 8.5 ≈ −0.96. The area below z = −0.96 on the standard normal curve is about 0.17, which is closest to 0.16. So the estimated probability is choice d, 0.16.

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