kennethDA19
04.10.2020 •
Mathematics
A driver has three ways to get from one city to another. There is an 80 % chance of encountering atraffic jam given he is on route A , a 60 % chance given he is on route B , and a 30 % chance given he is onroute C. Because of other factors, such as distance and speed limits , the driver uses route A 50 % of thetime and routes B and C each 25 % of the time. If the driver calls the dispatcher to inform him that he isin a traffic jam, find the probability that he selected route A
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Ответ:
The probability is 0.64
Step-by-step explanation:
What we want to calculate here is conditional probability.
Let P(A )= Probability of using route A = 50% = 0.5
Let P( B )= probability of using route B = 25% = 0.25
Let P (C )= probability of using route C = 25% = 0.25
Let T be the probability that he will be in a traffic Jam
The probability that he will be in a traffic Jam if he uses route A = 80%
Mathematically this is written as P( T | A) which is read as probability of T given A
so P( T | A) = 0.8
Same way for B and C which can be written as follows;
P( T | B) = 60% = 0.6
P( T | C) = 30% = 0.3
Now, what do we want to calculate?
He is in a traffic Jam, and we want to find the probability that he used route A. This means we want to find P(A) given T which can be written mathematically as P ( A | T)
We can find this using the other parameters and especially the equation below;
P ( A | T) = P(A) • P( T| A) / {P(A) • P ( T | A) + P(B)• P(T| B) + P(C) • P(T|C)
P( A | T) = (0.5 * 0.8)/ ( 0.5)(0.8) + (0.25)(0.6) + (0.25)(3) = 0.4/(0.4 + 0.75 + 0.075) = 0.4/0.625 = 0.64
Ответ:
0.025 miles per minute OR 1/40 ? Maybe sorry if this incorrect
Step-by-step explanation: