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I am confused I worked out the following and I got the wrong answer

Can anyone explain where I went wrong for future reference please it is in case it ever comes up again

Equation of Yi=a + bxi.

-0.5(4.86/3.50) or 4.86/3.50*-0.5

Time spent on PC predictor
Time spent working on PC response

Standard Deviation 4.86 pc time

Standard Deviation time spent
working is 3.50

Correlation -0.5

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