Answer
$R^{2} = 58\%$. Hence, the value of $R^{2}$ has decreased by adding the new observation.
Work Step by Step
Given above.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.