https://imgur.com/a/owz3LsN

part a to this question i thought it’s simple make the distribution X~B( 1,0.25) and then do (X=0) to work out if there’s no faults but no?…

part a to this question i thought it’s simple make the distribution X~B( 1,0.25) and then do (X=0) to work out if there’s no faults but no?…

Original post by esha06

https://imgur.com/a/owz3LsN

part a to this question i thought it’s simple make the distribution X~B( 1,0.25) and then do (X=0) to work out if there’s no faults but no?…

part a to this question i thought it’s simple make the distribution X~B( 1,0.25) and then do (X=0) to work out if there’s no faults but no?…

Looks like they expected you to use a poisson rather than binomial. Its a poisson because there could be 3 signal failures say in 1 day, whereas a binomial assumes that the max number of signal failures is 1 as thats the number of days.

(edited 1 month ago)

Original post by mqb2766

Looks like they expected you to use a poisson rather than binomial. Its a poisson because there could be 3 signal failures say in 1 day, whereas a binomial assumes that the max number of signal failures is 1 as thats the number of days.

omg i was thinking that but i literally don’t ever remember us doing poisson distribution in school 💀 i’m so done for this exam

Original post by esha06

omg i was thinking that but i literally don’t ever remember us doing poisson distribution in school 💀 i’m so done for this exam

i dont think poisson is on the a level maths spec . maybe further maths?

Original post by carbon1k

i dont think poisson is on the a level maths spec . maybe further maths?

Original post by esha06

omg i was thinking that but i literally don’t ever remember us doing poisson distribution in school 💀 i’m so done for this exam

Its the first question in

https://qualifications.pearson.com/content/dam/pdf/International%20Advanced%20Level/Mathematics/2013/Exam%20materials/WST02_01_que_20170626.pdf

and mark scheme

https://www.physicsandmathstutor.com/download/Maths/A-level/S2/Papers-Edexcel/June%202017%20(IAL)%20MS%20-%20S2%20Edexcel.pdf

(edited 1 month ago)

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