Question

In the Dominican Republic in August, the distribution of daily high temperature is approximately normal with mean 86 degrees Fahrenheit (°F). Approximately 95% of all daily high temperatures are between 83°F and 89°F. What is the standard deviation of the distribution?

approximately 95% means approximately 2 s.d. from the mean

the s.d. is approximately ... (89º - 83º) / 4

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