Probability: coin toss

  • Thread starter Amy-Lee
  • Start date
  • #1
Amy-Lee
27
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Pravesh and Solly usually go to a coffee shop during their lunch break and toss a coin to see who will pay. The probability that Prevesh will pay three days in a row is

(1) 0.025
(2) 0.500
(3) 0.125
(4) 0.015

My attempt (I am not sure if this is right)

X= number of days that Prevesh will pay

x- P(x)
0 - 0.250
1 - 0.250
2 - 0.250
3 - 0.250

So I assume that the correct answer is (1)?
 

Answers and Replies

  • #2
Master7731
14
0
i think since pravesh would have 1/2 chance of paying for a lunch on one day, you would have to multiply that by 3 and the odds become less for him to pay 3 times in a row therefore you would get 1/8 from 1/2 * 1/2 *1/2. Getting 0.125
 
  • #3
Amy-Lee
27
0
Thank you
 
  • #4
berkeman
Mentor
64,177
15,400
i think since pravesh would have 1/2 chance of paying for a lunch on one day, you would have to multiply that by 3 and the odds become less for him to pay 3 times in a row therefore you would get 1/8 from 1/2 * 1/2 *1/2. Getting 0.125

Please do not do the OP's homework for him. It is cheating, and not allowed here at the PF.
 

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