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riadik2000 [5.3K]
2 years ago
6

Please help me with this dont guess pls!

Mathematics
2 answers:
dexar [7]2 years ago
8 0

Answer:

B

Step-by-step explanation:

inn [45]2 years ago
7 0

Answer:

3357

Step-by-step explanation:

You might be interested in
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
When June sits down today to read she notices she is on page 20 of a 200 page book. She decides to read 4 pages of this book eve
Olegator [25]
The answer is b. 60 || 4x10=40, 40+20=60
5 0
3 years ago
Read 2 more answers
Hellllppppp meeeeeee plzzzzz fasttttt
valentinak56 [21]

Answer:

A rate: a measure, quantity, or frequency, typically one measured against some other quantity or measure.

A unit rate: When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. If you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.

Hope this helps.



4 0
3 years ago
GIVING THANKS AND BRAINLIEST FOR BEST ANSWER &lt;3<br> ::::::::
belka [17]

Answer:

B) 10

Step-by-step explanation:

6 + 4 = 10

7 0
3 years ago
Find the GCF of 4y and 12y
Marianna [84]

Answer:

4y

Step-by-step explanation:

To find the greatest common factor of 2 numbers, factor both of the numbers:

4: 1, 2, 4

12: 1, 2, 3, 4, 6, 12

The greatest factor here in both of these lists is 4. These numbers also both have a factor of y, so you multiply those together and get 4y.

4\times y=4y

5 0
2 years ago
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