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4 years ago

HELP i dont know how to do this

Mathematics

1 answer:

Korvikt [17]4 years ago

3 0

Answer

Step-by-step explanation:

First, lets go through B-D and explain why they are correct.

B= f represents the number of flash drives. This means that the coefficient, 10, would be the cost per flash drive.

C= n represents the number of cases of paper. it says so in the question, so that one is a bit easier.

D= f represents the amount of packages of hanging folders. If the coefficient for B is the cost, then that would be the same case for D. Therefore it is correct because the coefficient is 13.

A would be incorrect because the coefficient represents the amount that one item costs. P is the packs of pencils, meaning that it would be $7 per pack of pencils.

Hope this helps!

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Step-by-step explanation:

Answer:

For function, every element of the domain must have a unique image in co-domain...

(A)Let us redefine each function as a set of ordered pairs

and see if they satisfy the above condition (A) of a function f1={(1,2),(2,3),(3,4)} ; (4,5) cannot be an ordered pair as 5 does not belong to co-domain , Thus the element 4 of domain does not have an image.

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What was the age distribution of prehistoric Native Americans? Extensive anthropological studies in the southwestern United Stat

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Answer:

$\bar X = \frac{\sum_{i=1}^n X_i f_i}{n}= \frac{1394}{88}=15.8$

$s^2 = \frac{88(32372) -(1394)^2}{88(88-1}=118.3$

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Step-by-step explanation:

Previous concepts

In statistics and probability analysis, the expected value "is calculated by multiplying each of the possible outcomes by the likelihood each outcome will occur and then summing all of those values".

The variance of a random variable Var(X) is the expected value of the squared deviation from the mean of X, E(X).

And the standard deviation of a random variable X is just the square root of the variance.

Solution to the problem

For this case we can calculate the properties required with the following table:

Interval Mid point (x) f x*f x^2 *f

_________________________________________

1-10 5.5 40 220 1210

11-20 15.5 15 232.5 3603.75

21-30 25.5 23 586.5 14955.75

>31 35.5 10 355 12602.5

________________________________________

Total 88 1394 32372

We assume that the mid point for the class >31 is 35.5 using the problem information.

For this case the expected value would be given by:

$\bar X = \frac{\sum_{i=1}^n X_i f_i}{n}= \frac{1394}{88}=15.8$

The variance owuld be given by this formula"

$s^2 = \frac{n(\sum x^2 f) -(\sum xf)^2}{n(n-1}$

And if we replace we got:

$s^2 = \frac{88(32372) -(1394)^2}{88(88-1}=118.3$

The standard deviation would be just the square root of the variance:

$Sd(X) = \sqrt{118.273}=10.9$

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