plz solve correctly

Question 1 Consider the table below which corresponds to the ages, measured to the nearest year, of students at a school. Age (years) Frequency |Cumulative Frequency 11 43 12 39 13 32 14 25 15 47 16 19 a) Complete the cumulative frequency column and state the number of students at the school. [3 marks] b) Calculate the mode and median average age. [2 marks] c) Calculate the mean average and standard deviation for the ages of the students at the school. Formulas for the mean average and variance are stated below, E. f. ' [5 marks]