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Claude7617
21.04.2020 •
Mathematics
Which of the following distributions can be used to solve the following problem? The average number of cars arriving at a drive-through fast-food restaurant is 3 cars in 10 minutes. What is the probability that exactly four cars will arrive in a 5-minute interval?
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Ответ:
You did not state the options to choose from, but I will give a suitable distribution for solving the given problem.
Poisson Distribution
Step-by-step explanation:
Poisson Distributions are used in calculating the probability of an event occurring over a given interval.
It is calculated using the formula
P(X = x) = [e^(-β)β^x]/x!
Where e = 2.718
β = mean or expected value of the variable.
x = number of successes of the event
Applying this to the given problem, suppose we are trying to find the probability that exactly four cars will arrive in 5 minute interval.
Average number of cars arriving = 3/10 = 0.3
The probability of success over a short interval must be the same probability over a long interval, so we have β = 0.3 × 5 = 1.5
x = 4
P(X = 4) = [e^(-1.5) (1.5)^(4)]/4!
= 0.047066518
≈ 0.0047
There is a 0.47% chance that exactly four cars will arrive in 5 minute interval.
Ответ:
x = 45
y = 60
z = 75
Step-by-step explanation:
We can create three different equations with the given variables:
x + y + z = 180
y + z = 3 x
z = y + 15
then we can use this last equation to substitute for 'z" in the second equation:
y + z = 3x
y + y + 15 = 3 x
2 y + 15 = 3 x
x = 2/3 y + 5
Then we can re-write the first equation in terms of y and solve for this unknown:
2/3 y + 5 + y + y + 15 = 180
2/3 y + 2 y = 160
8/3 y = 160
y = 3 * 160 /8
y = 60
Then x = 2/3 (60) + 5 = 45
so x = 45
and finally: z = 60 + 15 = 75
so z = 75