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  1. T

    Probability question to be calculated in R

    Yeah not sure how I ended up writing sigma/n when my code has sigma/sqrt(n). Cheers for your help, stats really blows my mind, yet it is really interesting. I'll checked out the website too. Take care :)
  2. T

    Probability question to be calculated in R

    Therefore, I'd be wrong plotting this to explain my answer, which is the probability of the sample of 16TV's lifetime being less than 4500 of the population would be 0.00134 or the light blue shaded area on the normal distribution compared with the population probability of 23%for all TV's of a...
  3. T

    Probability question to be calculated in R

    ok, in Rstudio this is how I put wrote it. I created 9600 random numbers using rnorm based on twice the mean or mu. Added it to a data.frame and then plotted it using ggplot2. Am I going about this the wrong way to get the normal distribution? and this is what happens when you try to teach...
  4. T

    Probability question to be calculated in R

    My view of the result of pnorm(Z) = 0.001349898 is that the probability of the vector < 4500 would 0.1% chance of successfully failing. That's it, nothing more? I haven't read the question wrong?
  5. T

    Probability question to be calculated in R

    I am trying to solve these two questions and would like to discuss my logic of how I found the answer and some help with comprehending the question. "The lifetime of a particular type of TV follows a normal distribution with =4800 hours, and = =400 hours. (a) Find the probability that a single...