Hello, I feel difficult on these questions.

Could you please help me with it?

Thanks.

1. [2 marks] A worker in an arena wants to measure the mean ammonia concentration levels from the air (measured in ppm). They collect 20 random air readings over a two week period and take the average of the ammonia concentration level. (a) What is the population in this scenario? (b) What is the sample in this scenario? (c) What is the parameter of interest? Include the correct notation for the parameter. ((1) What is the random variable being measured here? ls this a discrete random variable or a continuous random variable? 2. [2 marks] The lengths of time, in minutes, that 12 patients waited in a doctor's office before receiving treatment were recorded as follows: 6, 30, 12, 14, 22, 15, 10, 40, 9, 15, 20, 19 (a) Treating the data as a random sample, find the median wait time. (Some work should be shown here.) (b) Treating the data as a random sample, find the standard deviation. (The standard deviation can be calculated with your calculator functions only, it is not necessary to show work here.)3. [2 marks] The amounts of a chemical compound 3; that dissolved in 100 grams of water at various temperatures :17 were recorded as follows: Calculate the covariance of the data