exam Maths Puzzle Numerical Ability

determine the total surface area of a cylinder whos length is 16 cm and a height if12 cm

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exam Other Question

subtract the sum of 7x^2-4x and -3x^2+4x from 2x^2+5x This question is not from a text book.
I am trying to find the standard deviation for this set of data. 75,65,50,90,80,60,70,85,80,85. The answer that i came up with is 42400 divide by 10. is this the way how?
Thank you so much for your help.