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Elan Coil [88]
3 years ago
6

Suppose you have a random variable that is uniformly distributed between 7 and 26. what is the expected value for this random va

riable? answer to one decimal place if necessary.
Mathematics
1 answer:
Daniel [21]3 years ago
4 0
\mathbb E(X)=\int_7^{26}\dfracx{26-7}\,\mathrm dx=\dfrac{33}2=16.5

which follows from the definition for expected value,

\mathbb E(X)=\int_{-\infty}^\infty xf_X(x)\,\mathrm dx

where f_X(x) is the probability density function for X.
You might be interested in
In a school, the ratio of soccer players to volleyball players is 4 : 1. The number of soccer players is how many times the numb
soldier1979 [14.2K]

Your question appears to be phrased incorrectly.  If the ratio of soccer players to football players is 4:1 then for every 1 football player there are 4 soccer players.  For example, if there are 3 football players, there would be 12 soccer players.

The equivalent expression would be   S = 4F

The statement: "there are 4 more soccer players than football players" is not the same thing.  It simply means that we add 4 to the total of football players to find out how many soccer players there are.

The equivalent expression would be   S = F + 4

That being said:  An equivalent ratio to 4:1  would be  8:2 ,  12:3,  16:4, ...

Think of the ratio as a fraction.  4:1 = 4/1

4/1 = 8/2 = 12/3 = 16/4 ..., etc.

3 0
3 years ago
Circle A has center (0, 0) and radius 3. Circle B has center (-5, 0) and radius 1. What sequence of transformations could be use
Dmitrij [34]

A translation of T(x, y) = (- 5, 2) and a dilation with center (- 5, 2) with a scale factor of 1 / 3 are necessary to transform circle A into circle B. (Correct choice: D)

<h3>What sequence of rigid transformations can be done on a circle</h3>

In this problem we must determine the sequence of transformations require to transform circle A into circle B. From analytical geometry we know that the equation of the circle in standard form is:

(x - h)² + (y - k)² = r²

Where:

  • (h, k) - Coordinates of the center.
  • r - Radius of the circle.

Then, we need to apply the following rigid transformations:

Translation

f(x, y) → f(x - h, y - k), where (h, k) is the translation vector.

Dilation with center at the center of the circle

r → k · r, where k is the scale factor.

The circle A is represented by x² + y² = 3, then we derive the expression for the circle B:

f(x, y) → f(x + 5, y - 2)

(x + 5)² + (y - 2)² = 9

r → k · r

(x + 5)² + (y - 2)² = (1 / 3)² · 9

(x + 5)² + (y - 2)² = 1

Then, a translation of T(x, y) = (- 5, 2) and a dilation with center (- 5, 2) are necessary to transform circle A into circle B.

To learn more on rigid transformations: brainly.com/question/28004150

#SPJ1

8 0
1 year ago
234.2 in expanded form
avanturin [10]

Answer:

Expanded Notation Form:

 

234.2

=

 

200

 

+

30

 

+

4

 

+

 

0.2

Expanded Factors Form:

 

 

234.2

=

 

2 ×

100

 

+

3 ×

10

 

+

4 ×

1

 

+

2 ×

 

0.1

Expanded Exponential Form:

 

234.2 =

2 × 102

+

3 × 101

+

4 × 100

+

2 × 10-1

Word Form:

234.2 =

two hundred thirty-four and two tenths

8 0
3 years ago
HELLLPPPP PLEASSSSEEE &amp;&amp;&amp; THANK UUUU
Maslowich

Answer:

y = -1/2x + 1

General Formulas and Concepts:

<u>Algebra I</u>

Slope-Intercept Form: y = mx + b

  • m - slope
  • b - y-intercept

Step-by-step explanation:

<u>Step 1: Define variables</u>

Slope <em>m</em> = -1/2

y-intercept <em>b</em> = 1

<u>Step 2: Write linear function</u>

y = -1/2x + 1

7 0
3 years ago
Look at the two patterns below:
ser-zykov [4K]

Answer:

The first five terms in Pattern B are 3, 7, 11, 15, 19.

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
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