How To Solve Facebook’s Raining In Seattle Interview Question

Math
People often email me that my videos helped them get a tech or finance job, which is really awesome, and I want to do more to help! So in this video I’m sharing a problem based on an interview question asked at Facebook.

Source
https://www.glassdoor.com/Interview/You-re-about-to-get-on-a-plane-to-Seattle-You-want-to-know-if-you-should-bring-an-umbrella-You-call-3-random-friends-of-y-QTN_519262.htm

(Note: I re-uploaded this video with corrections. The original calculations were correct but I used the wrong notation. Since I want everyone to ace their job interview, I posted a correction as soon as possible! Thanks to everyone who pointed out the mistake! Original: https://youtu.be/wUP93Co4MY8)

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