exam Maths Puzzle Numerical Ability

Find the standard diviation of the data set to the nearest tenth:
(21,13,18,16,13,35,12,8,15).

Thank You

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exam Other Question
v2=49.3m/s
t=4.9s
a=-5.44m/s2
v1=?
This is from a worksheet not a textbook. I am pretty sure you use the acceleration formula on this. Can someone help me on this problem?

I need to solve and show proof on the following equation:

5x + 8 + 3x -x + 5 = 6x -3

Thanks,
Lisa