Probability ..... :S (1 Viewer)

[wrxsti]

a spinner with A E I O U has an equal chance of landing on each
how many times must the spinner be thrown so it will stop on "E" at least once......
i dont have answers to this past paper but can someone see if this is right...

Probability NOT on 5 = 4/5 so (4/5)^n
Probability of a 5 is 1 - (4/5)^n now for 99% sure it should be
1 - (4/5)^n > 0.99
taking log and simplifying n = 20
is it right :S:S thanksss

 

[Ahmed A]

:s
you sure do luv ur probability dnt ya hehe
i wuddof thought it was one of those complementary questions
find the probibility of scoring the rest and then 1 - (your answer)
... :s

 

[wrxsti]

lol.... probablity is my worst topic...... i used to struggle in it so much.... teacher once gave us a test outa 130...... the first 10 questions were probability....... VERY SIMPLE ONES......... i ended up getting 120/130 ..... lol my whole first page was wrong.....

 

[Mattamz]

dont these sort of question usually say something to the effect of "find the number of spin need to be 99% sure of getting an E'. by my reckoning you cant be sure that youll get an E.

 

[wrxsti]

dont these sort of question usually say something to the effect of "find the number of spin need to be 99% sure of getting an E'. by my reckoning you cant be sure that youll get an E.

yer whoops i forgot to include dat part................ :S