Non parametric plot of $R(t)$

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Here is the attached question from the book, introduction to reliability engineering.

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Here is the attached solution related to it, but i don't know whether it is correct or not. I just want someone to edit or tell me how to do it or you can share some relevant source for understanding this, i don't have the book and it is not available on internet

Solution: enter image description here enter image description here

I know there is not any non parametric plot. Can you tell m how to plot it!?