4.1 The box-and-whisker plots below show the March Test Mathematical Literacy results for the 2022 and 2021 Mokone High School Mathematical Literacy classes . 2021 H 0 10 20 20 Q 30 40 50 60 70 80 90 100 2022 Use the diagram above to answer the questions that follow. 4.1.1 Write down the minimum and maximum marks for the 2021 class. (2) 4.1.2 The class of 2021 had 120 Mathematical Literacy learners. Calculate the number of learners who got a mark that was less than the Lower Quartile (Q1) as well as the value of Q1. 4.1.3 Calculate the interquartile range (IQR) for the 2022 class marks. You may use the formula: (4) IQR=Q3-Q1 (4) 4.1.4 Compare the two box-and-whisker-plots and decide on the class whose learners performed better in the March test. Justify your answer. (4)​