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breanna602
23.10.2021 •
Mathematics
• Review the examples from James Stewart on improper integrals before attempting the exercise.
• Type in word and submit as pdf.
• Show all your working.
• Presenting calculator’s work/copy and paste will result to a zero score.
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Ответ:
52.8%
Step-by-step explanation:
To solve this exercise, we must follow this formula:
Probability (P) = (Length of shaded region) * (Height of shaded region)
The best way to understand this exercise is to graph it. Attached, you can see the graphic representation of this uniform distribution (Graph 1).
1. Determine the total length and length of shaded area .
The length is 9, which is the maximum time that a passenger waits.
However, in the formula we are asked about the "length of the shaded area". According to the statement, the statistical event that is important to us is "waiting time greater than 4.25 minutes". Therefore, the length of the shaded area ranges from 4.25 to 9 (This can be seen in graph 2).
To calculate this length, we simply do this substraction:
9 - 4.25 = 4.75.
2. Determine the shaded region height:
To find this element we use the following formula :
Height = 1 over b-a
Where a is the minimum point of the total length, that is 0, and b is the maximum, that is 9.
When replacing we have:
Height = 1 over 9-0
You can see that the shaded region height equals the total height (Graphs 1 and Graphs 2).
3. Replace the data in the original formula:
P (time greater than 4.25) = (Shaded region length) * (Shaded region height)
P (time greater than 4.25) = (4.75) * (1/9)
P (time greater than 4.25) = 0.5277
We round and put in percentage terms:
(0.528)*100
= 52.8%