The level of pesticides found in the blubber of whales is a measure of pollution of the oceans by runoff from land. Suppose that the concentration of the insecticide dieldrin in all male minke whales is N(340 ng/g, 50 ng/g). The concentration is measured in nanograms per gram of blubber. In repeated samples of 8 male whales, we can expect that 95% of the time, our mean concentration of the insecticide dieldrin is less than what value? Round to 3 places.