Answer
(29.5 cm to 42.1 cm)
Work Step by Step
99.7% of all lengths would mean finding the range of three deviations from the mean (35.8).
$35.8-2.1*3 = 35.8-6.3 = 29.5 cm$
$35.8+2.1*3 = 35.8+6.3 = 42.1 cm$
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