One of the data values in the data set shown is missing.

71, 74, 84, 85, 77, 90, ?

Given that mean is not the best measure of center for the data set, which of these could be the missing value?

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