The Downtown Parking Authority of Tampa, Florida, reported the following information for a sample of 228 customers on the number of hours cars are parked and the amount they are charged.

Number of Hours Frequency Amount Charged

1 18 $3

2 38 6

3 50 9

4 45 13

5 20 14

6 16 16

7 5 18

8 36 22

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228

Find the mean and standard deviation of amount charged and round three decimal places