Question: In the model y = 100 + 5x + 10z with standard error equal to 8.1, if you know that x is equal to 10

In the model y = 100 + 5x + 10z with standard error equal to 8.1, if you know that x is equal to 10 and z is equal to 20 then the then the 95% confidence intervals for your forecast of y will be equal to

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