Answer
$P(at~least~eight)=0.821$
On about 821 of every 1000 days, there will be at least 8 calls between 3:10 p.m. and 3:15 p.m.
Work Step by Step
$P(at~least~eight)=P(x\geq8)=1-P(x\lt8)=1-0.179=0.821$
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