Find the heights of the first three blades of grass by clicking the tip of each blade. Measure the heights to the nearest tenth of a centimeter. Record the heights in Table A.
8.2
Now that you have the heights of all eight blades of grass, calculate the average height of the grass. Record the average height of the grass in Table A of your Student Guide.

What is the average height?
cm

Tooth enamel consists mainly of the mineral calcium hydroxyapatite, ca_10(po_4)_6(oh)_2. trace elements in teeth of archaeological specimens provide anthropologist with clues about diet and diseases of ancient people. students at hamline university measured strontium in enamel from extracted wisdom teeth by atomic absorption spectroscopy. solutions with a constant total volume of 10.0 ml contained 0.726 mg of dissolved tooth enamel plus variable concentrations of added sr. added sr find the concentration of sr in the 10 ml sample solution in parts per billion = ng/ml. find the concentration of sr in tooth enamel in parts per million = mu g/g.