A cell phone provider has 85% of its customers rank their service as "satisfactory." Nico takes a random sample of 75 customers from this cell phone provider. What is the probability that 83% or more of this sample ranks the
provider's service as "satisfactory"?
Find the z-table here.

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