The number of sick days taken (per month) by 200 factory workers is summarized below. Number of Days   Frequency 0 − 5     110   6 − 10     70   11 − 15     13   16 − 20     7   The cumulative percent frequency for the class of 16−20 is _____.   a. 90%     b. 10%     c. 100%     d. 3.5%

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