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Checkpoint6 due wed 9-1-10

# Checkpoint6 due wed 9-1-10 - 8.1 14 1 4 9 15 25 36(9 15 2 =...

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8.1 14) 1, 4, 9, 15, 25, 36 (9 + 15) ÷ 2 = 24 ÷ 2 = 12 18) 41, 43, 56, 67, 69, 72 Since all numbers appear only once there is no mode. 20) 9, 8, 10, 9, 9, 10, 8 Mode: 9 24) 238+159+87+163+198 = 845 238 159 87 163 +198 845 845 ÷ 5 = 169 169 5)845 5 34 30 45 45 Mean = 169 miles per day 36) 193, 185, 163, 186, 192, 135, 158, 174, 188, 172, 168, 183, 195, 165, 183 a) 193+185+163+186+192+135+158+174+188+172+168+183+195+165+183=2640 193 185 163 186 192 135

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158 174 188 172 168 183 195 165 +183 2640 2640 ÷ 15 = 176 176 15)2640 15 114 105 90 90 b) 135, 158, 163, 165, 168, 172, 174, 183, 183, 185, 186, 188, 192, 193, 195 Median: 183 c) In this case the median number is the most useful representative of the final examination. I justify it that both median and mode coincide, so they have priority over the mean. Another explanation could be adding the set of three numbers in the middle: 174 + 183 + 183 = 540/3 = 180. From this we see that the number 180 is closer to 183 than 176 is to 183. So, this should prove that the median is more useful. 8.2 2) a. 510,000,000 b. 3,800,000
4) 32.4… 9400000)305000000 2820000 2300000 1880000 4200000 3760000 440000 231.49… 17400000)4028000000 34800000 54800000 52200000 26000000 17400000 86000000 69600000 164000000 156600000 8000000 32.4 people per square feet to 231.5 people per square feet 6) 2,556,000,000 – 1,591,000,000 = 965,000,000 2,556,000,000 – 1,591,000,000 965,000,000 6,279,000,000 – 4,028,000,000 = 2,251,000,000 6,279,000,000 – 4,028,000,000 2,251,000,000 2,251,000,000 – 965,000,000 = 1,286,000,000

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2,251,000,000 – 965,000,000 1,286,000,000 133.26 965000000)1286000000 96500000 321000000 289500000 315000000 289500000 255000000 193000000 620000000

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