The following data describe the costs for two pediatric clinics with the same revenue. Calculate the average and sample standard deviation of weekly costs. Which clinic is riskier?

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Week 1 2 3 4 5 6 7 00 8 9 10 11 12 13 14 15 16 17 18 Clinic 1 $21,616 $21,462 $20,812 $19,308 $20,544 $19,712 $18,682 $19,994 $19,359 $19,334 $20,034 $20,283 $19,435 $21,746 $18,419 $19,359 $19,140 $18,721 Clinic 2 $23,041 $19,382 $22,156 $15,757 $21,145 $17,867 $17,767 $16,514 $18,553 $20,330 $20,166 $20,131 $16,275 $16,200 $15,171 $24,460 $21,365 $22,551