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I need help on parts a and b of a practice quiz problem #2 for an introductory statistics college course. I got the height as

I need help on parts a and b of a practice quiz problem #2 for an introductory statistics college course. I got the height as 84 for the missing bar for part a, but haven't yet attempted part b. Can you let me know if my part a is correct/ if not show me how to do these two parts? I've attached screenshots of the two problems below.

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