A level maths binomial distribution question
12
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?…
Reply 1
21
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 year ago)
Reply 2
esha06
OP
12
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
Reply 3
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?
Reply 4
esha06
OP
12
Original post by carbon1k
i dont think poisson is on the a level maths spec . maybe further maths?
Reply 5
21
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 year ago)
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