Tickets marked up 35% to $59.40, what's the original price

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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

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section