A student holds a ruler between their thumb and index finger, suddenly releases it, and then as fast as possible, captures it again, measuring the distance it has dropped. They repeat this four additional times, finding drops of 0.28, 0.24, 0.30 and 0.31 m. What is the student's average reaction time, and what is the standard deviation of those times? can you show me this in calculation and paste the data into a spreadsheet and solve it there. I am confused how to paste it onto a spreadsheet and calculate it there. please show me written calculations and spreadsheet calculations if possible

Drop distance (m) 0.28 0.24 0.30 0.31