Answer:
Any bolt length lesser than 4.90 cm or greater than 9.10 cm will be destroyed
Step-by-step explanation:
Given that:
Mean length = 7 cm
Standard deviation = 1.10 cm
Any bolt outside 2 standard deviations is to be destroyed
The bolt lengths that will be destroyed is obtained as shown below:
![\begin{gathered} =\mu\pm n\sigma \\ \mu=7cm \\ n=2 \\ \sigma=1.10cm \\ \text{ } \\ \text{Substitute the variables into the formula, we have:} \\ =7\operatorname{\pm}(2*1.10) \\ =7\operatorname{\pm}2.10 \end{gathered}]()
This therefore means that any bolt length lesser than 4.90 cm or greater than 9.10 cm will be destroyed