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Reika [66]
3 years ago
12

What is the surface area of a box that is 12 inches long, 6 inches wide, and 4 inches deep. A. 288 sq inches B. 22 cu inches C.

248 sq inches D. 120 sq inches
Mathematics
1 answer:
iren [92.7K]3 years ago
7 0
120 sq inches I believe
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Assume the time required to complete a product is normally distributed with a mean 3.2 hours and standard deviation .4 hours. Ho
Alex787 [66]

Answer: 3.712 hours or more

Step-by-step explanation:

Let X be the random variable that denotes the time required to complete a product.

X is normally distributed.

X\sim N(\mu=3.2\text{ hours},\ \sigma=0.4\text{ hours} )

Let x be the times it takes to complete a random unit in order to be in the top 10% (right tail) of the time distribution.

Then, P(\dfrac{X-\mu}{\sigma}>\dfrac{x-\mu}{\sigma})=0.10

P(z>\dfrac{x-3.2}{\sigma})=0.10\ \ \ [z=\dfrac{x-\mu}{\sigma}]

As, P(z>1.28)=0.10  [By z-table]

Then,

\dfrac{x-3.2}{0.4}=1.28\\\\\Rightarrow\ x=0.4\times1.28+3.2\\\\\Rightarrow\ x=3.712

So, it will take 3.712 hours or more to complete a random unit in order to be in the top 10% (right tail) of the time distribution.

3 0
3 years ago
7 times as much as sum of 1/3 and 4/5
Salsk061 [2.6K]
So the formula is
7*(1/3+1/5) = x

First find the common denominator of the fractions.  In this case the common denominator of 3 and 5 is 15 so we must convert them to 15ths.  To do that we divide 15 by the denominator and take that answer and multiply the numerator by it.

So for 1/3 we take 15/3(denominator) = 5 and multiply the numerator (1) by it

5 * 1 = 5 so 1/3 converts to 5/15

Do the same for 1/5 we take 15/5 = 3 and multiply the numerator (4) by it

3*4 = 12 so 4/5 converts to 12/15

Now we add 5/15 and 12/15 = 17/15 so we have our formula now to

7*17/15

We make seven a fraction 7/1 and multiply across 7*17 = 119 and 15 * 1 = 15

We have 119/15 which when we divide and get 7 14/15 as your answer
8 0
3 years ago
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lutik1710 [3]
I hate math its so hard for no reason
6 0
2 years ago
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Help. integrated math 2A
LUCKY_DIMON [66]
Here are the pairing:

The first tile should be paired with 4th property

The second tile should be paired with the 1st property

The third tile should be paired with the 3rd property

The fourth tile should be paired with the 2nd property
7 0
3 years ago
You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. You can ride your bike around
ollegr [7]
Oh gosh why is this so hard
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