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  1. J

    emperical rule

    does anyone understand this question? Thanks in advance!
  2. J

    joint probability

    I am not really sure how to calculate question C. Can anyone help me out? Thanks in advance!
  3. J

    normal distribution

    Hi everyone! I have a question about the answer of question 19a and e. question a: Find the probability that X is greater than 60. Why do they do 0,5 -0,3944 and not 1 - ...? Question e was: the probability is 0,05 that X is in the symmetric interval about the mean between which two numbers...
  4. J

    poisson distribition question

    Hello everyone, I don't really understand the answer of question a. The question was: Find the probability that on any given day there will be fewer than two breakdowns on this highwayduring the morning rush hour. Additional information: on average: 3,2 breakdowns per day occur. isn't it...