- Find the mean of the following data set? 1,3,6,8,12?

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Nachos or Salsa? How can geologists use a rock cycle diagram? Whatâ€™s the biggest solar system on earth? When a mass volume move at the speed of light does it not shrink to zero or even below zero volume? The half-life of barium-139 is 86 minutes. If you start with 100 grams of barium-139, how much will be left at the end of 4 half-lives?