2020 Prob Distributions Worked Solutions AS91586

Worked solutions for the Probability Distributions paper from 2020. This video was made before Mark Scheme was available, so if you find mistakes, leave a comment below and I will add edits to the video description with details of the corrections!
Corrections:
10:45 Q 2 b i error on calculator input, the answer should be 0.2365
Update: In some of the questions with more wordy explanations, my answers differ a little from the published mark scheme. You should look up the mark scheme to be sure you would include all the details they are looking for. There's often some room for different answers here, but it would be a judgement call from the marker.

[zlrkw]

hello miss, for Q2 (b)(i) at 10:45. I think the answer should be 0.2356.

[Rob-tscx]

Q3 b)iii ( the last question) the company A total cost is 82100 not 81600.

[junsongliu]

Hi Miss. Nzqa had released 2021 paper for 91585 and 91586 now. Can you please make a video about those two of them?