The Scholars selected 12 fruit stores for research and listed their sal es revenue in the past month (unit: 10000 yuan) as follows:: 18.4 23.2 22.3 14.5 15.6 16.6 35.8 47.5 28.0 22.5 a. Provide a five-number summary and explain it. b. Compute the lower and upper limits. c. Is there any outliers? d. Show the box plot.