exam Maths Puzzle Numerical Ability

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Find the value for the correlation coefficient r.

x 5, 1, 4, 2, 3
y 5, 10, 12, 4, 8

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exam Other Question

Solve.

An 800 g solution of acid and water contains 128 g of acid. What percent of the solution is acid? Complete the ordered pair so that it satisfies the given equation.
3x � 5y = �18: (___, 3)