11. A bag of chips manufactured by Lays weighs 300 grams with a standard deviation of 10 grams. The weights of the chips are normally distributed. Sketch a normal curve with an appropriately shaded area for each question below. Only use z-score table on the formula sheet. a) Determine the percentage of bags of chips, to the nearest tenth, that a bag of chips will weigh less than 315 grams. [1] b) Lays considers bags of chips that weigh more than 292 grams to be acceptable. Determine the percentage of bags of chips, to the nearest tenth, that will be acceptable. [1] c) If 5 000 bags of chips are produced in a production run, how many would be considered acceptable? [1] 12. In a recent survey of high school students, 40% of those surveyed said they would vote for the Red Wings as their favourite hockey team. The survey is considered accurate to within 15%, 19 times out of 20. a) Determine the confidence level [1] b) Determine the confidence interval. [1] c) If a high school has 1800 students, state the range of students who would state the Red Wings are their favourite team. [1]