Calcium is essential to tree growth because it promotes the formation of wood and maintains cell walls. In​ 1990, the concentration of calcium in precipitation in a certain area was 0.12 milligrams per liter​ (mg/L). A random sample of 10 precipitation dates in 2007 results in the following data table.  0.072 0.071 0.089 0.241 0.113 0.179 0.115 0.212 0.334 0.111   Construct a 90% confidence interval about the sample mean concentration of calcium precipitation. What is the lower bound? The upper bound?

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