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3 years ago

What is an atom? and what is the difference of atom and molecule

2 answers:

7 0

Elements, which are composed of a single type of atom, contain different numbers of protons. Molecules are formed when two or more atoms bond together. If molecules contain atoms of different elements, that substance is known as a compound.

Anettt [7]3 years ago

6 0

Answer: An atom is the basic unit of matter and the defining structure of elements. The difference between an atom and a molecule is that molecules are formed when two or more atoms bond together. If molecules contain atoms of different elements, that substance is known as a compound. Atoms make up molecules.

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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

Three times n equals 45

prohojiy [21]

3n = 45 n= 15 super simple ;)

3 0

4 years ago

Read 2 more answers

PLEASE HELP ASAP!!

Kisachek [45]

Answer:

my answer is C $69.87

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

Help please! I need the answers for the two fill-in-the-blanks.

ryzh [129]

Answer:

The first column is transformation

The second one I have forgotten

Need other help

3 0

4 years ago

The pitch of a roof is its slope. The roof of a home rises vertically a distance of 8 ft through a horizontal distance of 15 ft.

PIT_PIT [208]

If we discuss this as if it is a triangle then the "rise" is the vertical side and the "run" is the adjacent side.
So the ratio of the rise to the run is 8 / 15 which equals 0.5333333333 
To find the angle of this roof pitch we look up the arc tangent of 0.5333333333 and we find that is 28.072 Degrees

Trigonometry Calculator:
http://www.1728.org/trigcalc.htm

4 0

3 years ago

What is an atom? and what is the difference of atom and molecule​

What is an atom? and what is the difference of atom and molecule