Unformatted text preview: 13 b. ∑x 2 = 4 2 + 2 2 + 6 2 + 1 2 = 57 c. (∑x) 2 = (13) 2 = 169 d. ∑(x1) = (41) + (21) + (61) + (11) = 3+5+1+0 = 9 19. a. ∑x = 3+4+2+6 = 15 b. ∑y = 2+1+3+4 = 10 c. ∑xy = (3*2) + (4*1) + (2*3) + (6*4) = 6+4+6+24 = 40 20. a. ∑x + 3 or (∑x) + 3 b. ∑(x  2) 2 c. ∑x 2 10 or (∑x 2 )  10...
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 Fall '07
 Lewin
 Harshad number, Abundant number, colds

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