The following are the ages of 8 people.

42 44 51 55 56 59 62 70 Answer the following questions. Each is worth 1 mark. a) Find the mean and median of the ages: Mean (3 d.p.): Median (1 d.p.): b) Use Excel to find the standard deviation (3 d.p.): c) Find the first quartile, third quartile, and interquartile range of the ages by hand. First quartile - Q1 (1 d.p.): Third quartile Q3 (1 d.p.): Interquartile range - IQR (1 d.p.): Now, suppose that 70 is mistakenly replaced by 700. d) Find the mean, median, standard deviation, and interquartile range of the ages. Mean (3 d.p.): Median (1 d.p.): Standard deviation (3 d.p.): Interquartile range - IQR (1 d.p.):