s1 prob question Watch

forestgumper
Badges: 0
Rep:
?
#1
Report Thread starter 8 years ago
#1
Show for any two events E and F: P(EUF)= P(E) + p(F) = p(ENF)

How do you just magically show that without putting example numbers in?

Given that E and F and independant events, express P(ENF) in terms of P(E) and P(F) and show E' and F are also independant.

IN a college, 60 students are studying one or more of the three subjects Geography, french and English.

Of these 25 do Geo, 26 french, 44 english
10 do geo and french, 15 do french and english, 16 do geo and english

Write the probability the student chosen at radnom from those studying english is also studying french.

Determine whether the events "studying geo" an "studying french" are independant.

A student chosen at random from all 60 students, find the probablity that student does all 3 subjects.

How on earth do you even do that?
0
quote
reply
rbnphlp
Badges: 11
Rep:
?
#2
Report 8 years ago
#2
(Original post by forestgumper)
IN a college, 60 students are studying one or more of the three subjects Geography, french and English.

Of these 25 do Geo, 26 french, 44 english
10 do geo and french, 15 do french and english, 16 do geo and english

Write the probability the student chosen at radnom from those studying english is also studying french.

Determine whether the events "studying geo" an "studying french" are independant.

A student chosen at random from all 60 students, find the probablity that student does all 3 subjects.

How on earth do you even do that?
draw a venn diagram ..If the events are independent then P(A|B)=P(A)
0
quote
reply
forestgumper
Badges: 0
Rep:
?
#3
Report Thread starter 8 years ago
#3
Yeh I tried drawing one...didn't really work out too well.
0
quote
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • University of Lincoln
    Mini Open Day at the Brayford Campus Undergraduate
    Wed, 19 Dec '18
  • University of East Anglia
    UEA Mini Open Day Undergraduate
    Fri, 4 Jan '19
  • Bournemouth University
    Undergraduate Mini Open Day Undergraduate
    Wed, 9 Jan '19

Were you ever put in isolation at school?

Yes (279)
27.51%
No (735)
72.49%

Watched Threads

View All
Latest
My Feed