exam Maths Puzzle Numerical Ability

(3,2); 2x + 3y = 12
x - 4y = -5

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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. A man built a house costing 9 times as much as the lot on which it was built. If the lot cost $5,000 less than 1/6 the cost of the house, what was the cost of each?