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Use the multiplier method to incrases £258 by 43%

Aproduction manager test 10 toothbrushes and finds that their mean lifetime is 450 hours. she then design sales package of this type of toothbrush. it states that the customers can expect the toothbrush to last approximately 460 hours. this is an example of what phase of inferential statistics

Use composition to determine if (x) or h(x) is the inverse of f(x) for the limited domain x2-1.