QUESTION 5 (a) The owner of a cleaning service in Selangor found that the demand for his service increased since pandemic COVID-19 hits Malaysia. He found that the cleaning machines need to be service every month compared to before the pandemic, otherwise the machines tend to defect. Assume that the number of defective machines has a distribution with a mean of eight and a standard deviation of 2. 1909. (1) Determine the number of the machines, n provided by the cleaning service company. Hence, calculate the probability of defect machines, p in this study. [5 marks] (ii) Find the probability that fewer than six machines were defective. [3 marks] (iii) Find the percentage of at least four machines that were good. [4 marks] (b) Twelve FTKEE's students were selected at random and underwent a test to measure their attitude toward online learning on a particular course in the previous semester. Assume that the attitude test result has a normal distribution. The results were recorded in Table (5(b). The attitude test scores results were recorded as follows