16. The number of customers served from 7 a.m. until 8 a.m. at a local coffee shop each day the last two weeks is shown below. Sunday 14 18 Monday 15 17 Customers Tuesday Wednesday Thursday 14 19 Friday 18 19 Saturday 18 20 16 19 15 18 A : . 14 15 16 1ż 18 19 20 14 15 16 17 18 19 20 D в :: ++ 14 15 16 17 18 14 15 16 17 18 19 20 19 20 • +9 ••.• +o ••.. ••+

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