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lilyrockstarmag
19.09.2019 •
Mathematics
There are 360 degrees of longitude (0 to 180e and 0 to 180w). there are 24 hours in a day thus 24 times zones. therefore each time zone is degrees of longitude wide. "do the math" as they say: 360 divided by 24= also if each degree of longitude at the equator is roughly 60 miles wide then each time zone is approximately miles wide at the equator.
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Ответ:
Since a sphere has a cross sectional area of a circle, it's revolution has a total of 360°. You should divide this evenly to the 24 existing time zones. Therefore, the angle measurement of the width of longitude for each time zone is 360°/24 = 15°. Each time zone has 15° width of longitude.
For the second question, we use dimensional analysis. This approach is used when you cancel out units that appear both in the numerator and denominator side. The simplified unit should conform to what is asked. In this case, it should be miles per time zone. The solution is as follows:
60 miles/° longitude × 15° longitude/time zone = 900 miles/time zone
Thus, each time zone is approximately 900 miles wide at the equator.
Ответ:
The probability is![0.0228](/tpl/images/0927/1534/c23ec.png)
Step-by-step explanation:
Let's start by defining the random variable
as :
Therefore, if
is a continuous random variable that has a normal distribution, we write
~
( μ , σ )
Where ''μ'' is the mean and ''σ'' is the standard deviation.
For the random variable
we write :
We need to find![P(G3000)](/tpl/images/0927/1534/e491a.png)
In order to calculate this, we are going to standardize the variable. This means, finding the equivalent probability in a normal random variable
We perform this because the random variable
~
is tabulated in any book or either you can find the table on Internet.
To standardize the variable we need to subtract the mean and then divide by the standard deviation ⇒
Because (G - μ) / σ ~![Z](/tpl/images/0927/1534/b53bd.png)
Finally,
⇒
= 1 - Φ(2)
Where '' Ф(x) =
'' represents the cumulative function of ![Z](/tpl/images/0927/1534/b53bd.png)
Looking for Φ(2) in any table,
We found out that the probability is![0.0228](/tpl/images/0927/1534/c23ec.png)