Answer:
It would be 86/9 because you would need to make it improper
Step-by-step explanation:
Answer:
Standard error
Step-by-step explanation:
The standard deviation of the distribution of sample means is called the standard error of the means.
It is denoted by: 
The standard error is calculated using the formula: 
where n is the sample size and
is the population standard deviation.
Answer:
80
Step-by-step explanation:
Use the equation 180-(70 +30)
The 60$ system had a greater percentage decrease because it was a lower number to begin with. Taking the same portion out of two different numbers will always be a greater decrease for the lower number.