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4 years ago

2 people can plough a field in 6 hours how long would it take 3 poeple to plough the field

Mathematics

1 answer:

creativ13 [48]4 years ago

3 0

Answer: It would take 9 hours to 3 people to plough the field

Step-by-step explanation:

Hi, first we have to calculate how much time spends 1 person to plough the field.

We have to divide the number of hours spent by the number of people.

2 /6 = 3 hours per people

So, we have the rate. Now we simply multiply it by 3 to answer the question.

3 x3 = 9 hours

It would take 9 hours to 3 people to plough the field

Feel free to ask for more if needed or if you did not understand something.

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Wires manufactured for use in a computer system are specified to have resistances between 0.11 and 0.13 ohms. The actual measure

Marina CMI [18]

Answer:

a) $P(0.11$

And we can find this probability with this difference and with the normal standard table or excel:

$P(-1.11$

b) $P(0.11 < \bar X < 0.13)$

And we can use the z score defined by:

$z = \frac{\bar X -\mu}{\frac{\sigma}{\sqrt{n}}}$

And using the limits we got:

$z = \frac{0.11-0.12}{\frac{0.009}{\sqrt{4}}}= -2.22$

$z = \frac{0.13-0.12}{\frac{0.009}{\sqrt{4}}}= 2.22$

And we want to find this probability:

$P(-2.22< Z$

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".

Part a

Let X the random variable that represent the resitances of a population, and for this case we know the distribution for X is given by:

$X \sim N(0.12,0.009)$

Where $\mu=0.12$ and $\sigma=0.009$

We are interested on this probability

$P(0.11$

And the best way to solve this problem is using the normal standard distribution and the z score given by:

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

If we apply this formula to our probability we got this:

$P(0.11$

And we can find this probability with this difference and with the normal standard table or excel:

$P(-1.11$

Part b

We select a sample size of n =4. And since the distribution for X is normal then we know that the distribution for the sample mean $\bar X$ is given by:

$\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})$

And we want this probability:

$P(0.11 < \bar X < 0.13)$

And we can use the z score defined by:

$z = \frac{\bar X -\mu}{\frac{\sigma}{\sqrt{n}}}$

And using the limits we got:

$z = \frac{0.11-0.12}{\frac{0.009}{\sqrt{4}}}= -2.22$

$z = \frac{0.13-0.12}{\frac{0.009}{\sqrt{4}}}= 2.22$

And we want to find this probability:

$P(-2.22< Z$

4 0

3 years ago

Read 2 more answers

How many factors of muliplication does 20 have

amid [387]

Here are some factors of 20!

1x20=20

2x10=20

4x5=20

5x4=20

Therefore there are 4 factors of 20.

4 0

3 years ago

Read 2 more answers

Is f(x) = sec x concave up or concave down at x = 17\pi/4

inessss [21]

Answer:

x^xtfr

Step-by-step explanation:

6 0

3 years ago

select the irrational number? A)√9 B)√12 C)√16 D)√20 E)√25 (there should be more than one answer)

GenaCL600 [577]

The answers are:
__________________________
[B]: "√12 " ; AND:
__________________________
[D]: "√20" .
__________________________
Note: "Irrational numbers" have decimals that are: 1) non-terminating; AND: 2) non-repeating.
__________________________
Consider the answer choices given; and consider the given information that there "should be no more than one answer.
__________________________________
Consider the following answer choices:
__________________________________
Choice A) "√9" = 3 . Rule out this choice.
__________________________________
Choice C) "√16" = 4 . Rule out this choice.
__________________________________
Choice E) "√25" = 5. Rule out this choice.
_________________________________
We are left with 2 (two) remaining answer choices:
[B]: "√12" ; and: [D]: "√20" .
_________________________________
If there are more than one answer, then these two choices should be the correct answer. However, let us explore these two choices, using a calculator.
____________________________
[B]: "√12" = 3.4641016151377546

[D]: "√20" = 4.4721359549995794
_________________________________
These two answer choices should the correct answers.

6 0

4 years ago

Two months later,The Jensen family takes their moms sedan on a different trip.When she fills the tank,Sally’s mom records the mi

riadik2000 [5.3K]

Answer:

18.04 gallons

Step-by-step explanation:

The cost of filling the empty tank of the vehicle is $71.98.

If each gallon of gas costs $3.99, then we have to find the volume of the sedan's tank in gallons.

Now, $3.99 is the cost of 1 gallon of gas.

Hence, $71.98 will be the cost of $\frac{71.98}{3.99} = 18.04$ gallons.

Therefore, the volume of the tank is 18.04 gallons. (Answer)

8 0

3 years ago

2 people can plough a field in 6 hours how long would it take 3 poeple to plough the field​

2 people can plough a field in 6 hours how long would it take 3 poeple to plough the field