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inn [45]
3 years ago
13

A computer store has 75 printers of which 35 are laser printers and 40 are ink jet printers. if a group of 10 printers is chosen

at random from the store, find the mean and variance of the number of ink jet printers.
Mathematics
1 answer:
JulijaS [17]3 years ago
6 0
Your mean for this problem would be 4.7 and you variance would be 2.5
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I have some questions regarding combinations in finite. Here is my first one I am stumped on:
podryga [215]

We will get the number of possible selections, and then subtract the number less than 25 cents.

We can choose the number of dimes 5 ways 0,1,2,3 or 4.
We can choose the number of nickels 4 ways 0,1,2 or 3.
We can choose the number of quarters 3 ways 0,1, or 2.

That's 5*4*3  = 60 selections 

Now we must subtract from the 60 the number of selections of coins that are less than 25 cents. These will involve only dimes and nickels. 

To get a selection of coin worth less than 25 cents:
If we use no dimes, we can use 0,1,2  on all 3 nickels.
That's 4 selections less than 25 cents. (that includes the choice of No coins at all in the 60, which we must subtract).

If we use exactly 1 dime , we can use 0,1,2, or all 3 nickels.
That's the 3 combinations less than 25 cents.

And there is 1 other selection less than 25 cents, 2 dimes and no nickels. 

So that's 4+3+1 = 8 selections which we must subtract from the 60.
 
Answer 60-8 = 52 selections of coins worth 25 cents or more.

8 0
3 years ago
Simplify (8m2+m+7m2)-(3m-4m3+2m2)
kondaur [170]

(8m^2+m+7m^2)-(3m-4m^3+2m^2)\\\\=8m^2+m+7m^2-3m+4m^3-2m^2\qquad|\text{combine like terms}\\\\=(4m^3)+(8m^2+7m^2-2m^2)+(m-3m)\\\\=4m^3+13m^2-2m

4 0
3 years ago
3 The volume of a cube is 8 ft}. What is the length of each<br> edge of the cube?
Sliva [168]
Answer: 2

Formula for cube is x^3 = 8
2^3 = 8
3 0
3 years ago
Read 2 more answers
What is the remainder when P(x)=2x3-3x2-5x-6 is divided by (x-3)
balu736 [363]

Answer:

remainder = 6

Step-by-step explanation:

Hope it helps.....

4 0
3 years ago
Multiply. Express each answer as a decimal.<br><br> 12⋅15<br> 34⋅200<br> (0.2)⋅60<br> (0.75)⋅20
katovenus [111]

Answer:

  1. 12×15=180
  2. 34×200=6800
  3. (0.2)×60=12
  4. (0.75)×20=15
3 0
3 years ago
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