Answer:
i think the answer is one third
Step-by-step explanation:
The value of the digit 2 ten times greater in 5426 is 400.
Step-by-step explanation:
The given is, the value of the digit 2 in 5426 is 20.
Step:1
Let, Y
where, Y is the value of the digit 2 ten times greater.
Step:2
Now, Y= 10X
( Y=10X is formed because of ten times greater than)
where, X is the value of digit 2 in 5426.
Step:3
Substitute,
X value in the equation
Y=10×20
Y=200
Result:
The value of 200 is digit 3.
So, the answer for digit 2 ten times greater is 400.
Answer:
We need at least 601 incomes.
Step-by-step explanation:
We have that to find our 
level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of 
.
So it is z with a pvalue of 
, so 
Now, find the margin of error M as such
In which 
is the standard deviation of the population and n is the size of the sample.
How many such incomes must be found if we want to be 95% confident that the sample mean is within $500 of the true population mean?
We have to find n, for which 
. So
Rounding up
We need at least 601 incomes.
