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Probability : Density and Distribution Functions - Sketch

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Assume that the proportion of commercial vehicles among users of the Humber Bridge varies randomly from day to day, with density {see attachment} over 0<x<1, where c is a constant. Show that c = 12, find the distribution function, and sketch the density and distribution functions over -1<x<2.
On what fraction of days is the proportion of commercial vehicles between 20% and 50%?

Verify that f(x) = -ln(x) for 0<x<1 is a density function and sketch it. Write A = (1/4,3/4) and B = (0,1/2). Use your density sketch to assess which is bigger, P(a) or P(A|B). Calculate both values and check your assessment.

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Probability Density and Distribution Functions are investigated. The solution is detailed and well presented. The response received a rating of "5" from the student who originally posted the question.

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Solution to 3.11.

Since is a density function, by definition of a density function, we have

So,

i.e.,

i.e.,

Now we want to find the distribution function F(x). By the relation between ...

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  • BSc , Wuhan Univ. China
  • MA, Shandong Univ.
Recent Feedback
  • "Your solution, looks excellent. I recognize things from previous chapters. I have seen the standard deviation formula you used to get 5.154. I do understand the Central Limit Theorem needs the sample size (n) to be greater than 30, we have 100. I do understand the sample mean(s) of the population will follow a normal distribution, and that CLT states the sample mean of population is the population (mean), we have 143.74. But when and WHY do we use the standard deviation formula where you got 5.154. WHEN & Why use standard deviation of the sample mean. I don't understand, why don't we simply use the "100" I understand that standard deviation is the square root of variance. I do understand that the variance is the square of the differences of each sample data value minus the mean. But somehow, why not use 100, why use standard deviation of sample mean? Please help explain."
  • "excellent work"
  • "Thank you so much for all of your help!!! I will be posting another assignment. Please let me know (once posted), if the credits I'm offering is enough or you ! Thanks again!"
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