The numbers of visitors every hour in a shop from 1 p.m. to 8 p.m. on Monday were recorded as 7, 10, 15, 22, 6, 4 and 13. The arithmetic mean of visitors is:
Number of visitors from 1 pm to 8 pm are $$7,10,15,22,6,4,13$$
Arithmetic mean = $$\dfrac{7+10+15+22+6+4+13}{7} = \dfrac{77}{7} = 11$$
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