The is a measure of variability that is simply the difference between the highest score and the lowest score. variance standard deviation median range

The correct answer is range.  Another way of describing this is the distance from the beginning of the data to the end.  The calculation that we do to find this distance is subtraction.

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post