3 years ago

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Mathematics

1 answer:

Zinaida [17]3 years ago

6 0

Answer:

7) 28 is 40% of 70

13) 200 seats

16) 45% = 54/120

18) ?

19) 20 papers

Most of these are on brainly so I tried to double-check but if I'm wrong I'm sorry :) okay I think I'm very wrong

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A production manager at a wall clock company wants to test their new wall clocks. The designer claims they have a mean life of 1

TEA [102]

Answer:

The correct answer will be "0.3043".

Step-by-step explanation:

The given values are:

$\mu = 15$

$n=41$

$\sigma^2=25$

then,

$\sigma=5$

If researchers know representative sample n > 30 and default deviation those who use z-test

∴ $P(x>15.4)$

⇒ $1-P(x$

⇒ $1-P(\frac{x-\mu}{\frac{\sigma}{\sqrt{n} } }$

⇒ $1-P(Z$

⇒ $1-0.695762$

⇒ $0.3043$

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3 years ago

A lighthouse is 105 m above sea level. A boat observes

Alexxx [7]

It helps to draw a picture.

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3 years ago

Solve for k:<br> -3/5k - 1 + 1/2k = 3

ikadub [295]

The answer would be -40 c:

6 0

3 years ago

! H E L P !<br><br> I have no idea, could you please answer them all I’d appreciate it.

Ostrovityanka [42]

The constant of proportionality is 5

For the first bar day: 1 cell phone sold: 5 (unit rate:5)

second bar day: 2 cell phones sold: 10 (unit rate:5)

third bar Day: 3 cell phones sold: 15 (unit rate: 5)

fourth bar day: 4 cell phones sold: 20 (unit rate 5)

Basically you divide the cell phones sold by the day or $\frac{rise}{run}$

Hope this helped <3

8 0

3 years ago

If m 2=27, what is the measure of the supplement of

Dmitry [639]

Supplementary angles sum to 180°

180-27=153°

4 0

4 years ago