Terrance tackled a total of 42 football players in the last 6 games. he tackled the same number of players each game. how many players did terrance tackle each game?

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How do you use the elimination method for this question? explain, because i really want to understand!

The brain volumes (cm cubed) of 50 brains vary from a low of 904 cm cubed to a high of 1488 cm cubed. use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 175.5 cm cubed, assuming the estimate is accurate if it is within 15 cm cubed