Thickness measurements of ancient prehistoric Native American pot shards discovered in a certain village are approximately normally distributed with a mean of 5 3 millimeters mm and a standard deviation of 0 7 mm For a randomly found shard fin the following probabilities Round your answers to four decimal places USE SALT a the thickness is less than 3 0 mm 0 0004 b the thickness is more than 7 0 mm c the thickness is between 3 0 mm and 7 0 mm