The accompanying data represent the tips left by 21 customers for the waitstaff at a local restaurant. Complete parts a through c below. $18.43 $10.46 $11.87 $7.48 $13.74 $9.32 $11.85 0 $16.46 $16 05 $12.73 $10.97 $12.15 $13.29 $10.76 $8.57 $17.79 $16.47 $18.02 $13.57 $9.77 $11.43 a. Calculate the 30th percentile for the data. The 30th percentile is (Type an integer or decimal rounded to two decimal places as needed.) b. Calculate the 40th percentile for the data. The 40th percentile is (Type an integer or decimal rounded to two decimal places as needed.) c. Calculate the 60th percentile for the data. The 60th percentile is (Type an integer or decimal rounded to two decimal places as needed.)