The pcb concentration of a fish caught in lake michigan was measured by a technique that is known to result in an error of measurement that is normally distributed with a standard deviation of .08 ppm (parts per million). suppose the results of 10 independent measurements of this fish are 11.2, 12.4, 10.8, 11.6, 12.5, 10.1, 11.0, 12.2, 12.4, 10.6(a) give a 95 percent confidence interval for the pcb level of this fish.(b) give a 95 percent lower confidence interval.(c) give a 95 percent upper confidence interval.