i need help with thesee

1. The number of bikes sold last year by various Honda dealers in a country is summarized below a) Calculate the mean and standard deviation for this sample data. Show your work. [3 marks] # of bikes Frequency 10-20 9 20-30 15 30-40 14 40-50 5 50-60 2 b) Calculate the z-score for 21 bikes sold. [1 marks]2. Below is a set of sorted data. The critical values of this data are also listed below. 16 38 38 40 42 43 45 50 51 55 56 57 60 60 90 Standard deviation = 16.01 Q1 = 41 Q2 = 50 Q3 = 56.5 a)Determine the interquartile range ( IQR) [1 mark] b)Determine the upper and lower boundaries and identify any outlier [3 mark] c)Draw the modified box-and-whisker below showing the outlier. [2 mark] 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100