A1.0-ml volume of seawater contains about 4.0 x 10^-12 g of gold. the total volume of ocean water is 1.5 x 1021l .calculate the total amount of gold (in grams) that is present in seawater and the worth of the gold in dollars. with so much gold out there, why hasn't someone become rich by mining gold from the ocean?

Lab reagent, hypothesis test. a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl. these six measurements are assumed to be an srs of all possible measurements from solution. they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution. carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.