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Math

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Does studying for an exam pay off? The number of hours studied, x, is compared with the exam grade received, y.

x 7 7 5 5 7
y 95 90 75 85 95

(a) Complete the preliminary calculations: SS(x), SS(y), and SS(xy).
Incorrect: Your answer is incorrect. . (SS(x))
Incorrect: Your answer is incorrect. . (SS(y))
Incorrect: Your answer is incorrect. . (SS(xy))

(b) Find r. (Give your answer correct to three decimal places.)
Can someone help me and my friend we have worked this out several times come up with the same answers but it is wrong. We would like to see where we are doing it wrong.

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