Twenty-eight applicants interested in working for the Food Stamp program took an examination designed to measure their aptitude for social work. A stem-and-leaf plot of the 28 scores (sample data) appears below. Stems Leaves 4 6 45 6 7 8 0 9 9 3688 026799 145667788 1234788 Leaf unit 1.0 = a) Find mean, median, and standard deviation of the data. What can you say about the shape of this distribution? Explain. b) Find the inter-quartile range of the data. c) Are there any unusual observations or outliers exist in the data? Justify your answer.