0 ≤ x < 10     10   10 ≤ x < 20     100   20 ≤ x < 30     220   30 ≤ x < 40     90   The midpoint of the last class is _____.   a. 34     b. 35     c. 50     d. 34.5     2)  The numbers of hours worked (per week) by 410 s

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