It seems that you have missed the necessary options for us to answer this question, but anyway, here is the answer. Based on the given scenario above about what Annabelle did, the kind of statistical investigation that she performed was a SURVEY. Hope this helps.
Yes you’re almost there the answer is negative 9
Picture isn't loading can you write it down?
1 gram is 1000 milligrams So 60 grams is 60,000 milligrams.