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 (mg/L). A random sample of 10 precipitation dates in 2007 results in the following data table.  0.074     0.084   0.081    0.278    0.119 0.183     0.124    0.243    0.314    0.107 Construct a 95% confidence interval about the sample mean concentration of calcium precipitation.  The lower bound is _____ The upper bound is _____ ( round to four decimal places as needed

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