3. Let x be a random variable that represents the average daily temperature (in degrees Fahrenheit) in July in a town in Colorado. The x distribution has a mean of approximately 75 F and standard deviation of approximately 8 F. A 20-year study (620 July days) gave the entries in the rightmost column of the following table. TIT TV Observed Region under Expected % from Number of Days Normal Curve XF Normal Curve in 20 Years 4 - 30 5 X