exam Maths Puzzle Numerical Ability

Calculate the range and the standard eviation for each set of numbers.

5,4,2,5,7,5,2,4,3,8,

The book does not give me clear directions can someone help me out.

Thanks

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exam Other Question

Write a formula that expresses the relationship described below
y varies directly as x and y = �10 when x = �7.

What are the key words that I should notice that helps me write formulas?....I know y = ?/? (-3) 3pie - (-8)(-2)