C) Class interval Frequency. (f) 100-124 5 125-149 8 150-174 16 175-199 12 200-224 7 225-249 2 Based on the table above, i. Find the standard deviation. (4 marks) ii. Draw a histogram. (3 marks)a) The following histogram shows the scores on the first statistics exam. 25 - 21 20 15 14 12 Frequency 10 3 50 60 70 80 90 100 Score i How many students took the exam? (1 mark) ii What is the class interval? (1 mark) iii What is the class midpoint for the first class? (1 mark) iv How many students earned a score of less than 70? (1 mark) v State the level of measurement. (1 mark) b) A random variable X has a Poisson distribution with mean 1.6. Find: i. P(X=2) (2 marks) ii. P(2