Please help! did I do this correctly?​

Write the sentence as an equation. z plus 372 is equal to 160

Draw a scaled copy of the circle using a scale factor of 2

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