QUESTIDH IE a} Chief Executive Ofcer of a company announced to launch a new product which is robot vacuum that help people cleaning up the oor with less effort. The quality test results indicate that battery life of a robot vacuum, X has a normal distribution with mean i'tl minutes and standard deviation 3 minutes. i} Given PUE 29D)=.t]228. show the value of s =li}. {3 marks} ii} Find the probability that a robot vacuum's battery life will test between 35 and 95. {3 marks) b} A counselling unit in a university found that 20% of the students have low motivation on online teaming. A survey is conducted on 250 randomly selected students. Calculate the probability that less than 33 students have low motivation on online teaming by using suitable approximation. {4 marks)