Amajor cell phone service provider has determined that the number of minutes per month that its customers use their phone is normally distributed with mean equal to 445.5 minutes and standard deviation equal to 22.75 minutes. the company is thinking of charging a lower rate for customers who use the phone the most. if it wishes to give the rate reduction to no more than 9 percent of its customers, what should the cut-off be?

we can say that the cut-off= 476.125 minutes

Step-by-step explanation:

mean = 445.5 minutes

standard deviation = 22.75 minutes

rate reduction not more than = 9%

The z score corresponding to (100-9)%= 0.91 is 1.35

by standard normal Table

we use

on calculating we get

x= 476.2125 minutes

Therefore, we can say that the cut-off= 476.125 minutes

the figures below are made out of circles, semicircles, quarter … find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations). remember that we'll also have to cut whatever areas we get in half, since we're only dealing

step-by-step explanation:

the answer would be 1 1/72

step-by-step explanation:

you can rewrite the equation by separating the parts and then solving individually:

10-9=1

1/8 - 1/9=

find l c d and then combine:

1 1/72