Calculating the Median from a Histogram

I'm not sure whether I'm missing something obvious, or just being stupid. I am so confused with this question, more specifically the first part.

Could someone help me, not just with the answer but the working out as well. Thank you.

I'm not sure whether I'm missing something obvious, or just being stupid. I am so confused with this question, more specifically the first part.

Could someone help me, not just with the answer but the working out as well. Thank you.

I have never come across a question like this, is it GCSE?

If so I've never been taught how to do it so I'd be interested in an solution also. Then again it could be incompetent teaching from my school as usual aha.