Need help in the following

Question 1 The water bill in dollars per month for 25 customers in Fiji is given below. Construct a grouped frequency distribution with 5 classes. 6.5 15 22.5 16 21 20.5 18 19 26.1 19 21 19.7 16 27 19 22 17.5 24.3 23 30 13.5 24.9 17 29 30.5 A. The lifespan of 12 randomly selected dogs of a particular breed were studied. The frequency distribution is shown here. Find the standard deviation. Years Frequency 1-3 4-6 7-9 -NAWN 10-12 13-15B. The following data give the marks obtained by 15 students in a 30 point test. 4 9 7 6 24 11 4 13 10 9 0 8 7 10 17 i. Calculate the 45th percentile. ii. Calculate the percentile rank of 17