exam Maths Puzzle Numerical Ability

Find the graph by plotting the points.

f(x)=3x-7

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exam Other Question

show that 7log(16/15)+5log(25/24)+3log(8180)=log2 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.