The unemployment rates for various countries ranges from 4.9 to 10.4, with Q1 =5.3 median = 6.6, Q3 = 7.6, a mean of 6.4, and a standard deviation of 2.1. In a boxplot, what would be the values at the outer edges of the box, and what would be the values to which the whiskers extend?
a. The highest unemployment rate was 10.4. Is it an outlier according to the three standard deviation criterion? Explain.
b. What unemployment value for a country would have a z-score equal to zero?