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2 years ago

Helppp!!!! please!!!

Mathematics

1 answer:

enot [183]2 years ago

3 0

Answer:

$b)151 {in.}^{3}$

Step-by-step explanation:

$v = \frac{1}{3} \pi {r}^{2} h$

$= \frac{1}{3} \times \frac{22}{7} \times {4}^{2} \times 9$

$= \frac{1}{3} \times \frac{22}{7} \times 16 \times 9$

$= \frac{3168}{21}$

$= 150.857$

$approximately \: 151 {in.}^{3}$

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Quality control studies for Speedy Jet Computer Printers show the lifetime of the printer follows a normal distribution with mea

Anika [276]

Answer:

About 3 years Speedy Jet printers be guaranteed.

Step-by-step explanation:

Given : Quality control studies for Speedy Jet Computer Printers show the lifetime of the printer follows a normal distribution with

mean $\mu = 4$ and standard deviation $\sigma = 0.78$

If the company wishes to replace no more than 10% of the printers.

To find : How long should Speedy Jet printers be guaranteed ?

Solution :

Using Z- table,

Z value corresponding to 10% or 0.10 = -1.28.

Applying z-score formula,

$z=\frac{x-\mu}{\sigma}$

The value of x is given by,

$x=(z\times \sigma)+\mu$

Substitute the values,

$x=(-1.28\times 0.78)+4$

$x=-0.9984+4$

$x=3.0016$

So, approx 3 years.

Therefore, About 3 years Speedy Jet printers be guaranteed.

8 0

2 years ago

What is the answer to -2(4g-3)=30

lbvjy [14]

Answer:

g = -3

Step-by-step explanation:

5 0

2 years ago

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Divide 33 photos into two groups so the ratio is 4 to 7

Artist 52 [7]

33 photos in a 4x to 7x ratio

4x + 7x = 33
11x = 33
x = 3

33 photos can be put in a 4(3) to 7(3) ratio

which is a 12 to 21 ratio

so 12 photos on one side, and 21 on the other side to get the ratio of 4 to 7

Note:
<span>a(b) = ab = a x b = a times b</span>

5 0

2 years ago

13. Jimmy is writing a paper for one of his classes. The paper has to be 3,000 words

Kipish [7]

Answer:

500

Step-by-step explanation:

3000 divided by 6

Hope this helped, sorry if I'm wrong!

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2 years ago

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Help me check my answer!

astra-53 [7]

Step-by-step explanation:

ah, here you go.

come on, now. you know this now ...

again, mutually exclusive attributes in the table (no overlap here) allow us to add the numbers for a total :

4+2+12+10 = 28 students in total.

how many of those 28 fulfill our desired criteria (has a brother) ?

well, it is the sum of the column "has a brother", as it does not matter, if there is also a sister or not.

so, it is 4 + 12 = 16

therefore, the probability to pick a student randomly, who has a brother is

16/28 = 4/7 = 0.571428571...

5 0

1 year ago