The number of sick days taken (per month) by 200 factory workers is summarized below. Number of Days   Frequency 0 − 5     120   6 − 10     55   11 − 15     15   16 − 20     10   The number of workers who took at most 10 sick days per month is _____.   a. 25     b. 175     c. 200     d. 55

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