Complete Question:
Suppose George wins 34% of all chess games.
(a) What is the probability that George wins two chess games in a row?
(b) What is the probability that George wins three chess games in a row?
(c) When events are independent, their complements are independent as well. Use this result to determine the probability that George wins three chess games in a row, but does not win four in a row.
Answer:
(a) [tex]Probability = 0.1156[/tex]
(b) [tex]Probability = 0.0393[/tex]
(c) [tex]Probability = 0.0259[/tex]
Step-by-step explanation:
Represent Win with W
So, we have:
[tex]W = 34\%[/tex]
Solving (a): Winning two in a row;
This is represented by WW and is calculated as thus:
[tex]Probability = W * W[/tex]
[tex]Probability = 34\% * 34\%[/tex]
[tex]Probability = 0.1156[/tex]
Solving (b): Winning three in a row;
This is represented by WWW and is calculated as thus:
[tex]Probability = W * W * W[/tex]
[tex]Probability = 34\% * 34\% * 34\%[/tex]
[tex]Probability = 0.039304[/tex]
[tex]Probability = 0.0393[/tex] (Approximated)
Solving (c): Wins three in a row but lost the fourth
Represent Losing with L
L is calculated as:
[tex]L = 1 - W[/tex] ---- Complement of probability
[tex]L = 1 - 34\%[/tex]
[tex]L = 66\%[/tex]
This probability is represented by WWWL and is calculated as thus:
[tex]Probability = 34\% *34\% *34\% *66\%[/tex]
[tex]Probability = 0.02594064[/tex]
[tex]Probability = 0.0259[/tex] (Approximated)