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Probability question

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banned7y, 2m agoPosted 7 years, 2 months ago
anyone good at maths? This is annoying i know the answer should be simple but i cant work it out!


Q1- 10 people buy a raffle ticket for a chance of winning a cake. Each have an equal chancing of winning the cake. What is the probability of 1 person winning the cake?

Q2 - This time around 10 people buy a raffle ticket but this time there are two cakes to win. What is the probability of 1 person winning a cake?

The first question is easy the second one im not sure about.


any ideas?
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banned7y, 2m agoPosted 7 years, 2 months ago
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(17) Jump to unreadPost a comment
Comments/page:
#1
is this a wind up?
#2
2 in 10 or
1 in 5
#3
Q1. 1 in 10 chance of winning

Q2. 1 in 5 chance of winning
#4
1. 100 percent chance of one of them winning the cake, its a raffle.

2. 0% chance of one person winning a cake, either two people will win a cake or one person win two cakes.
#5
harlzter
100 percent chance of one of them winning the cake, its a raffle.


Haha
#6
Oh i love HUKD's lol
#7
smallian
2 in 10 or
1 in 5


you sure about that? surely after the first cake in question 2 has been won,the odds are then one in nine for the remaining players?
#8
depends on the type of cake
banned#9
barky
you sure about that? surely after the first cake in question 2 has been won,the odds are then one in nine for the remaining players?


this is what my issue is that the chance of winning the first cake in Q2 is 1/10 and the probability of winning the second cake is 1/9 but what is the probability of winning a cake?
#10
raptorcigs;6900606
depends on the type of cake


Mississippi mud pie.
#11
2nd.
1 chance in 10
then 1 chance in 9
overal, a 2 in 9.5 percent chance, or effectively, 1 in 4.75.

or, sod all chance cos by the time you've all worked it out, I've eaten the cake.
#12
surely if they draw the winner of the first cake its 1 in 10 then the second one is 1 in 9
#13
ROKO;6900623
this is what my issue is that the chance of winning the first cake in Q2 is 1/10 and the probability of winning the second cake is 1/9 but what is the probability of winning a cake?


None, usually a fix and the old lady from the Womens Institute will have hoovered it down with her earl grey :whistling:
banned#14
Jumpingphil
Q1 10 people 1 cake, probability is 1 in 10.

Q2 10 people 2 cakes, probability is 2 in 10 = 1 in 5.


Alternate answers.
Q1 It's a dead certainty that one person will win a cake.
Q2 It's also a dead certainty that one person will win a cake but they might be very lucky and win another one too.


for the second question if the person wins the cake they can not win the second cake also.
#15
the long and the short of it from a teachers point of view is that there are several answers for each question as the question itself in ambiguous:

1) 1/10 or 100% depending on how the question is interpreted
2) 0% (as either 1 person has 2 or 2 people have 1) or 19/90 chance based on a 1/10 chance becoming a 1 in 9 chance
#16
raptorcigs
depends on the type of cake


harlzter
Mississippi mud pie.


Then I should win all 3 cakes.

hth :)
#17
Surely if it takes too long to work out, the cake will have gone off and nobody will want it!

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