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3 years ago

If we multiply every observation in a data set by 2, the mean will

Mathematics

1 answer:

Pie3 years ago

5 0

If the values increase then the mean will as well, but if only the observations increase, the mean will decrease.

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What is (2m+7)+(4d+6)

SpyIntel [72]

Answer:

4d+2m+13

Step-by-step explanation:

5 0

3 years ago

PLEASE HELP ASAP! I have reposted this 2 times and no one will help me.:( please answer all 4 thank you so much!! i need this do

erik [133]

Answer:

5. DE

6. 3 cm

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3 years ago

Solve the system using substitution. Show your work.<br> x = -4y + 9<br> x - y = 4

FromTheMoon [43]

Answer:

please what should we found? is it the value of ×or y

6 0

3 years ago

Read 2 more answers

20x^2-30=4x solve for x

ankoles [38]

Answer:

x=1.3288 or -1.1288

Step-by-step explanation:

Given $20x^{2}-30=4x$

Subtract 4x from both sides

$20x^{2}-4x-30=0$

Since we can factor out 2 from whole equation, let's factor out 2.

$2(10x^{2}-2x-15)=0$

Divide with 2 on both sides

$10x^{2}-2x-15=0$

We got the quadratic equation, we can solve for x using quadratic formula.

$x=\frac{-b\pm\sqrt{b^{2}-4ac} } {2a}$

$x=\frac{2\pm\sqrt{2^{2}-4X10X(-15)} } {2X10}$

$x=\frac{2\pm\sqrt{604} }{20}$

$x=\frac{2\pm2\sqrt{151}}{20}$

$x=1.3288or-1.1288$

8 0

3 years ago

Read 2 more answers

All athletes at the Olympic games are tested for performance-enhancing steroid drug use. The imperfect test gives positive resul

Nana76 [90]

Answer:

0.4%

Step-by-step explanation:

We have two independent events

The athlete who is being tested for drugs actually is using steroids.
The test went wrong indicating a false result.

The probability of 1) to happen is 0.04 because "4% of all registered athletes use steroids".

The probability of 2) ti happen is 0.1 because "The imperfect test gives positive results (indicating drug use) for 90% of all steroid-users"

Then the probability of 1) and 2) to happen is given by

$P=P(1)*P(2)=(0.04)(0.1)=0.004$ =0.4%

3 0

3 years ago