Question 8 Suppose collection of all quiz marks ofa class of students is normally distributed with amean of 7 and a standard deviation of 1. Sketch the normal curve with the shaded area'and corresponding endpoints (values on the horizontal axis) to show the middle 95% of the marks (hints: use empirical rule or 68%- 95%- 99.7% rule) mean 2 ;L Question 9 Referring t0 Question 8, calculate the probability that a student will receive a mark less than 5, Question 10 Question 11 Related to Question 10: Calculate the standard error (write your answer up to 4 dp)