1) The number of leaves that a type of tree shed in a week was recorded, with the following results: 21; 22; 22; 24; 27; 28; 30; 32; 33; 60 Use this sample data to solve the following: (a) Calculate the mean. (b) Calculate the median. (c) Calculate the variance. (d) Calculate the standard deviation. (e) Interpret the standard deviation in terms of the problem.

2) Continue with the data in Problem 1.

(a) Calculate the first quartile. (b) Calculate the third quartile. (c) Calculate the lower cutoff for outliers, using the box- plot method. (d) Calculate the upper cutoff for outliers, using the box- plot method. (e) Identify any outliers in the dataset. (f) Calculate the 30thth percentile