Need help with probability question

  • Thread starter Thread starter ms. confused
  • Start date Start date
  • Tags Tags
    Probability
AI Thread Summary
The probability question involves a roulette wheel with 38 numbers, where the goal is to find the probability of landing on an even number other than 0 or 00. There are 18 even numbers between 1 and 36, and since 0 and 00 are excluded, the total number of favorable outcomes remains 18. The total possible outcomes are 38, leading to a probability calculation of 18/38. Simplifying this fraction results in 9/19, which matches the textbook answer. Understanding probability as the ratio of favorable cases to total cases is essential for solving such problems.
ms. confused
Messages
90
Reaction score
0
I don't know how to do this probability question:

A roulette wheel consists of 38 numbers: 1 to 36, 0, and 00. What is the probability that a roulette ball will come to rest on an even number other than 0 or 00?

My textbook says the answer is 9/19 but I don't know how they got that. Please help!
 
Physics news on Phys.org
There are 18 even numbers between 1-36. Add two to your denominator and then you have an 18/38 chance of getting an even number that isn't 0 or 00. Reduce your fraction by dividing by two.

9/19
 
The probability in this case just consists of counting the number of outcomes you're interested in versus all possible outcomes. How many even numbers are there on the roulette wheel ? How many numbers in total ?
 
ms. confused said:
I don't know how to do this probability question:

A roulette wheel consists of 38 numbers: 1 to 36, 0, and 00. What is the probability that a roulette ball will come to rest on an even number other than 0 or 00?

My textbook says the answer is 9/19 but I don't know how they got that. Please help!

You should be knowing that probability is basically the number of favorable cases devided by the number of all possible cases.
The number of possible cases is obviously 38,because all 38 numbers have a chance of showing up,and moreover,this chance is equal,since they are all distinct.
The number of favorable cases is the number of even numbers in the list excluding 0 and 00.I'll let u think about it.Once u got this number right,plunge it,together with 38,in the definition of probability and I'm pretty sure you'll get 9/19.

Daniel.
 
Last edited:
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Similar threads

B Roulette wheel physics and probability
Replies
9
Views
5K
B How might determinism affect probability?
2
Replies
69
Views
5K
B Relative And Absolute Probability (Probability Of Picking A Red Ball)
Replies
8
Views
2K
I What is the impact of preprogrammed velocities on roulette probabilities?
Replies
4
Views
2K
Solving for φ on an oscillation problem
Replies
17
Views
1K
I Probability to get a certain number or less by throwing two 6-faced die
Replies
6
Views
2K
Help Me Tackle This Question: How Do I Start?
Replies
8
Views
1K
Probabilities on a spinner
Replies
3
Views
248
Binomial Central Limit Theorem
Replies
5
Views
4K
Projectile motion when kicking a ball that lands on an upward slope
Replies
13
Views
3K

Hot Threads

Recent Insights

Back
Top