How can I solve for the question below?

3. (adapted from J3 W 4.230,) The values below are the rates of return (multiplied by 100) on the Dow-Jones industrial average for the years 19962005: 0.6 3.1 25.3 16.8 7.1 6.2 16.1 25.2 22.6 26.0 Do these data seem to be normally distributed? Provide a Q-Q plot based on the Mahalanobis (squared) distances with a Chi-squared distribution reference to justify your