1. (10 Marks) Consider the following sample data set. 9.3, 11.7, 112, 13, 9.9, 124, 12, 11.3, 9.2, 12.7, 7.2
(a) [3 marks] Compute the mean and the standard deviation of the sample.
(6) [3 marks) Calculate the median and the first quartile.
(c) (4 marks) If this data set is from a normal distribution, how many observations
would you expect to lie within one standard deviation of the mean? Check whether
this expectation is met for this data set