Answer
$P(X \geq 7) = 0.055$
Work Step by Step
P(a randomly selected rental unit has seven or more rooms) corresponds to bars No. 7, 8 and 9 of the histogram. Hence:
$P(X \geq 7) = P(X=7) + P(X=8) + P(X=9)$
= 0.037 + 0.013 + 0.005
= 0.055
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