Answer:
20.27
Step-by-step explanation:
The Central Limit Theorem estabilishes that, for a random variable X, with mean and standard deviation , the sample means with size n of at least 30 can be approximated to a normal distribution with mean and standard deviation
Using the Central Limit Theorem for Means, what is the standard deviation for the sample mean distribution?
This is s when . So
So the correct answer is:
20.27
Step 1
<u>Find the total meters of ribbon</u>
we know that
One spool of ribbon holds meters
so
by proportion
find the amount of meters of spools
the total meters of ribbon is
Step 2
<u>Find the total cost of the ribbon </u>
Multiply by the total meters of ribbon
therefore
the answer is
The total cost of the ribbon is
Step 3
<u>Find how much ribbon will be left</u>
we know that
the club uses meters to complete a project
so
Subtract meters from the total meters of ribbon
the total meters of ribbon is -----> see Step 1
therefore
<u>the answer is</u>
The ribbon that will be left is
The area of the circle is <span>112.98 m squared</span>
Technically, all of the choices can be written as a difference of squares. Just find the square root of both terms and use the formula
where and are terms.
However, I am going to assume that your problems want to know if the expressions can be written as a difference of two squares, where and are either variables with an even exponent or a perfect square, as this is what many instructors are asking for.
A) A cannot be written as a difference of two squares, because even though 25 is a square, is not a variable with an even exponent, which means that we can not apply the Differences of Squares.
B) Similar to Choice A, we cannot apply the Differences of Squares given the context because 18 is not a perfect square.
C) We can apply it to Choice C, since has an even exponent and 36 is a perfect square. Applying the formula, we get:
11 HOMES TO 8 AWAYS IS THE ANSWER