question 3 please help

QUESTION 1 Use the following sample data (age) to answer questions 1-3: Round to two decimal places 15, 24, 31, 22, 21, 42, 27, 28, 35, 23, 35, 16, 28, 40, 23, 36, 20, 29, 22 Using SPSS, what is the mean for these data? 27.21 QUESTION 2 What is the median ? 25.5 QUESTION 3 What is the standard deviation? Round to two decimal places QUESTION 4 Using these data: A statistics professor conducts a study to investigate the relationship are selected for the experiment. Just before taking a quiz, the 10 students are given a maintel and tear