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1. Calculate the standard deviation and interpret the results for the following data set: {2, 4, 3, 8, 10}. (10 marks)

2. Calculate the probability that a value selected at random from a normal distribution with mean 5 and standard deviation 2 will lie between 2 and 7. (6 marks)

3. If 40 software engineers have a mean time taken to complete a particular task of 35 minutes, and a standard deviation of 12 minutes, what percentile does a person need to belong to in order to have taken more than 50 minutes to complete the task? (14 marks)