The mean amount μ for all of the invoices for your company last month is not known. based on your past experience, you are willing to assume that the standard deviation of invoice amounts is about $200. if you take a random sample of 100 invoices, what is the value of the standard deviation for x?

σ = $20

Step-by-step explanation:

The standard deviation of a sample mean is given by:

Where σ is the mean standard deviation and n is the random sample size.

In this case, the mean standard deviation is σ = $200 and the sample size is n = 100, therefore:

The standard deviation for x is $20.

hey there!

if she's saving for six months, let's divide the total number we need for the trip by six, dividing it into the amount that needs to be saved for each month.

500 ÷ 6 =

she needs to save at least this amount each month, so we should use this symbol: ≥

let x be the amount she saves each month.

your final answer is x ≥

hope this !

the correct answer is b. negative exponential growth.

step-by-step explanation:

you can tell it's an exponential function because it decreases rapidly then levels out and never touches the x-axis.

it is negative because the y-axis decreases as the x-axis increases.

therefore it is a negative exponential growth graph.

hope i !