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3 years ago

What is the sum of -2 and -7

Mathematics

2 answers:

shutvik [7]3 years ago

8 0

Answer: -9

Step-by-step explanation:

Serga [27]3 years ago

6 0

-2-7 is equal to -9

hope this helps

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and are independent Gaussian (Normal) random Variables. has mean 13.9 and variance 5.2; has mean 6.9 and variance 3.8. . (a) Cal

omeli [17]

This question is incomplete, the complete question is;

X and Y are independent Gaussian (Normal) random Variables. X has mean 13.9 and variance 5.2; Y has mean 6.9 and variance 3.8. . (a) Calculate P( W> 10)

Answer:

P( W> 10) is 0.1587

Step-by-step explanation:

Given that;

X ⇒ N( 13.9, 5.2 )

Y ⇒ N( 6.9, 3.8 )

W = X - Y

Therefore

E(W) = E(X) - E(Y)

= 13.9 - 6.9 = 7

Var(W) = Var(X) + Var(Y) -2COV(X.Y)

[ COV(X,Y) = 0 because they are independent]

Var(W) = 5.2 + 3.8 + 0

= 9

Therefore

W ⇒ N( 7, 9 )

P( W > 10 )

= 1 - P( W ≤ 10 )

= 1 - P( W-7 /3 ≤ 10-7 /3 )

= 1 - P( Z ≤ 1 ) [ Z = W-7 / 3 ⇒ N(0, 1) ]

from Standard normal distribution table, P( Z ≤ 1 ) = 0.8413

1 - P( Z ≤ 1 ) = 1 - 0.8413 = 0.1587

Therefore P( W> 10) is 0.1587

8 0

3 years ago

Please help me this is due today at 11:59

k0ka [10]

Answer:

NM corresponds with DC, and the scale factor is 3

7 0

2 years ago

For party decorations, you buy 6 rolls of crepe paper and 20 balloons for $11.90. After you start decorating, you determine that

Morgarella [4.7K]

Answer:

Find out the how much did each roll of crepe paper cost .

To prove

Let us assume that the cost of the roll of crepe paper be x.

Let us assume that the cost of the balloon be y .

As given

For party decorations, you buy 6 rolls of crepe paper and 20 balloons for $11.90.

Than the equation becomes

6x + 20y = 11.90

As given

After you start decorating, you determine that you need more party decorations.

You buy 2 more rolls of crepe paper and 15 more balloons for $6.05.

Than the equation becomes

2x + 15y = 6.05

Than two equations are

6x + 20y = 11.90 and 2x + 15y = 6.05

Multiply 2x + 15y = 6.05 by 3 and subracted with 6x + 20y = 11.90

6x - 6x + 45y -20y = 18.15 - 11.90

25y = 6.25

$y = \frac{6.25}{25}$

y = $0.25

Put in the equation 2x + 15y = 6.05

2x + 15 × 0.25 = 6.05

2x = 6.05 - 3.75

2x = 2.3

$x = \frac{2.3}{2}$

x = $1.15

Therefore the each roll of crepe paper cost is $1.15 .

6 0

3 years ago

Read 2 more answers

Which list shows these numbers In order from least to greatest?

garik1379 [7]

Answer:

2,4,3,1

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers

Write -33/12 as a mixed number in reduced form. -2 -1 -2 -2

AysviL [449]

-33/12. Lets forget the negative symbol.

12 goes into 33, 2 times with 9 remaining.

So now get the negative sign back.

It will be -2 9/12 but you can reduce that to -2 3/4.

Hope this helps :)

7 0

3 years ago