A student measured the lead content of a paint sample 6 times. The standard deviation of the measurements was found to be 0.70% of the average. Calculate the confidence interval at the 90% confidence level. A solution of F is prepared by dissolving 0.08720.0005gNaF (molar mass =41.9890.001g/mol ) in 159.000.06mL of water. Calculate the concentration of Fin solution and its absolute uncertainty. Significant figures are graded for this problem. To avoid rounding errors, do not round your answers until the very end of your calculations