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S_A_V [24]
3 years ago
11

What is 15x7 for the real answer?

Mathematics
2 answers:
Molodets [167]3 years ago
7 0
Your answer would be 105. Hope this helps!
Sphinxa [80]3 years ago
6 0
15= 10+5

7(10). 7(5)
^. ^
70. + 35


70
+ 35
______
105


The answer is 105
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Suppose that X is a random variable with mean 30 and standard deviation 4. Also suppose that Y is a random variable with mean 50
Vladimir79 [104]

Answer:

a) Var[z] = 1600

    D[z] = 40

b) Var[z] = 2304

    D[z] = 48

c) Var[z] = 80

    D[z] = 8.94

d) Var[z] = 80

    D[z] = 8.94

e) Var[z] = 320

    D[z] = 17.88

Step-by-step explanation:

In general

V([x+y] = V[x] + V[y] +2Cov[xy]

how in this problem Cov[XY] = 0, then

V[x+y] = V[x] + V[y]

Also we must use this properti of the variance  

V[ax+b] = a^{2}V[x]

and remember that

standard desviation = \sqrt{Var[x]}

a) z = 35-10x

   Var[z] = 10^{2} Var[x] = 100*16 = 1600

   D[z] = \sqrt{1600} = 40

b) z = 12x -5

   Var[z] = 12^{2} Var[x] = 144*16 = 2304

   D[z] = \sqrt{2304} = 48

c) z = x + y

   Var[z] =  Var[x+y] = Var[x] + Var[y] = 16 + 64 = 80

   D[z] = \sqrt{80} = 8.94  

d) z = x - y

   Var[z] =  Var[x-y] = Var[x] + Var[y] = 16 + 64 = 80

   D[z] = \sqrt{80} = 8.94

e) z = -2x + 2y

   Var[z] = 4Var[x] + 4Var[y] = 4*16 + 4*64 = 320

  D[z] = \sqrt{320} = 17.88

   

7 0
3 years ago
Please help me with this math problem:)
Anastaziya [24]
A y-intercept always has to have an x-value of 0 so the answer is D (the last option)
5 0
2 years ago
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How many tons are in 6,000 pounds ?
bagirrra123 [75]

Answer:

3

Step-by-step explanation:

3 0
3 years ago
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What is the equation of the line show In this graph? ASAP!! Please
Lyrx [107]

Answer:

The equation is y= 1

Step-by-step explanation:


8 0
3 years ago
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Find the geometric mean of 20 and 25​
IrinaK [193]

Answer:   √20⋅25=22.36

Step-by-step explanation:

Geometric mean of 20 and 25 is √20⋅25=22.36(2dp)

5 0
2 years ago
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