Answer:
a
b
Step-by-step explanation:
From the question we are told that
The mean is 
The standard deviation is 
Generally 2 year is equal to 24 months
Generally the percentage of total production will the company expect to replace is mathematically represented as

Generally 

Generally from the z-table

So

Converting to percentage

=>
Generally the duration that should be the guarantee period if Accrotime does not want to make refunds on more than 6% is mathematically evaluated as

=> 
From the normal distribution table the z-score for 0.06 at the lower tail is

So

=>
Answer:
You can use a calculator for the decimal operations, but practice some by hand because on the quiz and the test you will not have a calculator.
Step-by-step explanation:
Answer:
Vacation pays are not included in salaries. Therefore, Jerry's calculation is wrong.
Step-by-step explanation:
Given is :
Jerry makes $40,000 a year working at a nearby factory.
He gets two weeks paid vacation per year, plus five other paid holidays.
So total paid holidays become =
days
Subtracting 19 from 365 days and assuming that Jerry works for 365 days a year.
We get =
days
So, his per day salary will be = 
Vacation pays are not included in salaries. Therefore, Jerry's calculation is wrong.