3. A manufacturer of toothpicks wonders What the mean Width of a toothpick is under a new manufacturing method. How many toothpicks must the manufacturer measure to be 90% condent that the sample mean is no farther from the true mean than 0.10 mm? Assume the conditions of the Central Limit Theorem are satised, and note that toothpicks produced under the old method had a standard deviation of 0.4 mm