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Because probability is a measure of how likely it is that some event will occur. If there is no chance at all that the even will occur than the probability is 0. If it will occur with 100% certainty, then it is 1 or 100% A negative number would have no meaning in terms of how likely an even is to occur?
The variable, height, is a continuous variable. The mode is not a good measure of central tendency for continuous variables because you would need a very large number of observations (pupils) before you are likely to get a useful number of repeat values. The modal class may be a good measure. Provided you do not have extremely short or extremely tall pupils, the mean would probably be the best.
The answer to page 13.10 in the Punchline Algebra book is typically a math problem or exercise that requires solving equations or manipulating algebraic expressions. As for where the tree invited all its friends on Friday night, this is likely a joke or riddle included in the book to add humor and engage students in the learning process. The answer to the joke would be a playful or imaginative location, not a literal event.
The setting
I honestly and truly don't knowHow will Charlie most likely change after his experience at the diner