Chapter: Normal Distribution  The running time for videos submitted to Youtube in a given week is normally distributed with μ=390 seconds and standard deviation σ = 148 seconds.  A) If a single video is randomly selected, what is the probability that the running time of the video exceeds 6 minutes (360 seconds)? B) Suppose that sample of 40 videos is selected. What is the probability that the mean running time of the sample exceeds 6 minutes?  Must show which tables were used, if it's area of the left, and a bell curve or the like.  (I have the answer, it's just that I would like better help understanding how to do the probelm and so it matches the answer I have for my book, as the answers I got before didn't match so I just want to be I know how to do the steps correctly. So it's supposed to be .5803 and normalcdf (360, 1E99, 390, 148)=.5803162711 for part A, and for part B it's .9001 and normalcdf (360, 1E99, 390, 148/√(40))=.9000793931. Thank you)

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.