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Vadim26 [7]
4 years ago
7

HELP!!!!!!! MATH QUESTION FOR 40) POINTS!!!!!!

Mathematics
2 answers:
gavmur [86]4 years ago
8 0

Answer:

8.49

6.00

5.29

1.79

Step-by-step explanation:

Sonbull [250]4 years ago
8 0

Answer:

Orange, Blue, Red, Green.

Orange would be the best deal.

Step-by-step explanation:

In order to put the unit costs per square foot from least to greatest, let's find the unit cost per square root of each wrapping paper.

To find the unit cost per square root, we simply have to divide the cost over the amount of square feet. So:

Red:

c=\frac{1.79}{12.5}=\$0.1432\text{ per square foot}

Blue:

c=\frac{5.29}{40}=\$0.13225\text{ per square foot}

Green:

c=\frac{8.49}{50}=\$0.1698\text{ per square foot}

Orange:

c=\frac{6}{60}=\$0.10\text{ per square foot}

So, to cost of wrapping paper per foot from least to greatest is:

Orange, Blue, Red, Green.

So, orange would be the best deal.

And we're done!

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In the game of​ roulette, a wheel consists of 38 slots numbered​ 0, 00,​ 1, 2,..., 36. To play the​ game, a metal ball is spun a
Oxana [17]

Answer:

E(X)=-0.0526

Sd(X)=5.763

Step-by-step explanation:

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.  

Let X be a random variable which denotes the money you may win or lose on each spin.

In the game of roulette, a wheel consists of 38 slots. To play the game, a metal ball is spun around the wheel and is allowed to fall into one of the numbered slots. If the number of the slot the ball falls into matches the number you selected, we win $35; otherwise we lose $1.  So we have just one possibility to win and 37 of lose on an individual game.

___________________________

X            P(X)

___________________________

35           1/38

-1            37/38

___________________________

In order to calculate the expected value we can use the following formula:

E(X)=\sum_{i=1}^n X_i P(X_i)

And if we use the values obtained we got:

E(X)=(35)*(\frac{1}{38})+(-1)(\frac{37}{38})=-0.0526

In order to find the standard deviation we need to find first the second moment, given by :

E(X^2)=\sum_{i=1}^n X^2_i P(X_i)

And using the formula we got:

E(X^2)=(35^2)*(\frac{1}{38})+((-1)^2)(\frac{37}{38})=33.211

Then we can find the variance with the following formula:

Var(X)=E(X^2)-[E(X)]^2 =33.211-(-0.0526)^2 =33.208

And then the standard deviation would be given by:

Sd(X)=\sqrt{Var(X)}=\sqrt{33.208}=5.763

4 0
3 years ago
Pls help extra points and mark brain-list
ella [17]
5(3+1)
5*(4)
=20
The answer is 20
5 0
3 years ago
WILL MAKE BRAINLIEST!!
Naddika [18.5K]

Answer:

B. juans solution is incorrect

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Pleas help I’m so lost
Svetradugi [14.3K]
Its the middle two. Hope I helped
5 0
3 years ago
If the cost of a 2.5 meter cloth is $30.5. What will be the cost of 22 meters ?
alisha [4.7K]

Answer:

268.40

Step-by-step explanation:

We can write a ratio to solve

2.5 meters        22 meters

-----------------  = --------------

30.5 dollars       x dollars

Using cross products

2.5 * x = 30.5 * 22

2.5x =671

Divide each side by 2.5

2.5x / 2.5 = 671/2.5

x =268.4

8 0
3 years ago
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