I understand part a, but I dont understand part b at all.
example question: https://imgur.com/a/L8A9Ero
example answer: https://imgur.com/a/lDeRfT4
The only advice given is to use interpolation, and I don't understand where 3/4 and 1/4 have come from. I understand interpolation for quartiles, and percentiles, but this is completely new to me.
Could any of you please explain it to me in simple terms, and help me out on some other questions?