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irina [24]
2 years ago
8

:. Solve for w. P = 2(1 + w)

Mathematics
2 answers:
iragen [17]2 years ago
6 0

answer : 1 = P/2 - 2

Airida [17]2 years ago
5 0
<h2>Answer:</h2>

w = (P - 2)/2

<h2>Step-by-step explanation:</h2><h3>Question :</h3>

What is the value of w in an equation of P = 2(1 + w)?

<h3>Solution :</h3>

P = 2(1 + w)

P = 2 + 2w

Reverse the equation,

2 + 2w = P

2w = P - 2

w = (P - 2)/2

<h3>Conclusion :</h3>

w = (P - 2)/2

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Step-by-step explanation:

Assuming this previous info : "Trucks carry barrels of crude oil from a port in Texas to a distributer in New Mexico on long  trailers. Filling equipment is used to fill the barrels with the oil. When functioning properly,  the actual volume of oil loaded into each barrel by the filling equipment at the port is  approximately normally distributed with a mean of 55 gallons and a standard deviation of 0.5  gallons. If the mean is greater than 55.4 gallons, the filling mechanism is overfilling."

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".

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Solution to the problem

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

X \sim N(55,0.5)  

Where \mu=55 and \sigma=0.5

We are interested on this probability

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

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

P(X>55.4)=P(\frac{X-\mu}{\sigma}>\frac{55.4-\mu}{\sigma})=P(Z>\frac{55.4-55}{0.5})=P(Z>0.8)

And we can find this probability using the complement rule:

P(Z>0.8)=1-P(Z\leq 0.8)

And in order to find these probabilities we can use tables for the normal standard distribution, excel or a calculator.  

P(Z>0.8)=1-0.788=0.212

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