Calcium is essential to tree growth. In 1990, the concentration of calcium in Chautauqua, New York, was 0.11 milligram per liter (mg/L). A random sample of 10 precipitation dates in 2022 results in the following calcium concentrations: 0.15, 0.09, 0.12, 0.14, 0.11, 0.16, 0.10, 0.13, 0.08, 0.17. What is the average calcium concentration in milligrams per liter (mg/L) for these dates?
a) 0.121
b) 0.112
c) 0.132
d) 0.142