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QUESTION 1 [17] 1.1 In December 2021, a logistics company delivered 10 782 parcels to customers. It took them an average of 4 working days to deliver the parcels to the customers with a standard deviation of 2.3 days. The logistics company is considering purchasing a new barcoding and scanning software programme which they hope will reduce the delivery time. The company tested the software on 600 randomly selected returns. The average delivery time for the 600 returns came to 2.8 days, with a standard deviation of 1.4 days. (5) 1.1 State the random variable of interest, X. [1] 1.2 Give the symbol for the population average delivery time, and what it is equal to. [1] 1.3 Give the symbol for the population standard deviation of the delivery time and what it is equal to. [1] 1.4 Give the symbol for the sample average delivery time and what it is equal to. [1] 1.5 Give the symbol for the sample standard deviation delivery time and what it is equal to. [1]