Answer
$P(x\geq20)=.1762$
Work Step by Step
$P(x\geq20)=1-P(x\leq19)=1-P(z\leq\frac{(19+.5)-16.25}{3.49})=1-P(z\leq.93)=P(z\geq0)-P(0\leq z\leq.93)=.5-.3238=.1762$
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.