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Answers to Homework # 2 CHAP 2 2. a) n = 2+2+4+0+1 = 9 b) ∑x = 2(5)+2(4)+4(3)+0(2)+1(1) = 31 c) ∑x 2 = 2(5 2 )+2(4 2 )+4(3 2 )+0(2 2 )+1(1 2 ) = 119 3. a) n = 1+2+4+3+1 = 11 b) ∑x = 1(5)+2(4)+4(3)+3(2)+1(1) = 32 c) ∑x 2 = 1(5 2 )+2(4 2 )+4(3 2 )+3(2 2 )+1(1 2 ) = 106 4. a) X                                  f                                  55-59 2 50-54 2 45-49 4 40-44 3 35-39 3 30-34 5 25-29 1 20-24 4 15-19 2 10-14 1 b) X                                  f                                  50-59 4 40-49 7 30-39 8 20-29 5 10-19 3 8. 9. a) 1+3+6+5+2 = 17

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b) ∑x = 1(1)+3(2)+6(3)+5(4)+2(5) = 55 10. a) histogram or polygon (ratio scale) b) bar graph (ordinal scale) c) bar graph (nominal scale) d) histogram or polygon (ratio scale) e) bar graph (ordinal scale) 13. a) X                                  f                                  9 2 8 5 7 7 6 3 5 1 4 1 b) negatively skewed 19. X
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