Denise made 9 sales calls on Monday, 6 sales calls on Tuesday, 7 sales calls on Wednesday, 9 sales calls on Thursday, and 11 sales calls on Friday. What was the average (arithmetic mean) number of sales calls that Denise made for these 5 days?
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A 8.4
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B 8.6
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C 8.8
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D 9.0
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E 9.2