How many people indicated that they brushed their teeth 5 times per day?

A marketing researcher for a toothpaste company wants to know how often on average people brush their teeth per day. He obtains a sample of adults. Their responses to his question are summarized in the following simple frequency distribution:
X f
10 1
9 0
8 0
7 3
6 3
5 0
4 4
3 3
2 8
1 2
0 1
Use this grouped frequency distribution to answer the following questions:


Ans: 0 (none)

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