a). Determine whether the following variables are discrete or continuous. In addition, determine the level of measurement. i. Average height of Nairobi Primary school students. [1 mark] ii. Number of mobile phones you have. [1 mark] iii. Annual salary income of a policeman. [1 mark] b).A pet shop is planning to survey dog owners in Nairobi to determine their purchasing habit. Questionnaires were sent to customers of the pet shop. The survey includes questions that are related to the following; Types of dogs Number of dogs owned i. Describe the population and sample of interest to the pet shop. [2 marks] ii. If the pet shop wants to select a sample of 1000 customers, how will a simple random sample be selected? [3 marks] iii. What type of survey errors will most likely be encountered by the researcher