Answer:
The correct answer is 180 out of 200 people
Step-by-step explanation:
Hope this helps :)
p.s check out Kahn Academy if you need some extra understanding
Answer:
And we can find this probability using excel or the normal standard tabe and we got:
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".
Solution to the problem
Let X the random variable that represent the temperatures of a population, and for this case we know the distribution for X is given by:
Where and
We are interested on this probability
And the best way to solve this problem is using the normal standard distribution and the z score given by:
If we apply this formula to our probability we got this:
And we can find this probability using excel or the normal standard tabe and we got:
Answer:
Step-by-step explanation:
The way i estimate is i first look at the dollars and i mutiply that by 4 ($1x4)
you get 4 then we look at the cent which is $0.98 i would add in about 4 times and i would get to about $3 maybe. (This is mental math)
After that add 4 and 3 and you get 7
the estimated cost is about 7-8 dollars.
exact cost is-7.92
The correct answer is the first one(a): To get the system B,..., the first equation multiplied by 4...
Explanation:
1. Let us first multiple the first equation in System A with 4, we would get:
4(2x - y) = 4 * 3
=> 8x - 4y = 12 --- (A)
Now add the equation (A) and the second equation of System A:
8x - 4y = 12
3x + 4y = 10
------------------
11x = 22
Hence,
System B:
2x - y = 3
11x = 22
-i
Answer:
Simplifying
x + 8y = 15
Solving
x + 8y = 15
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-8y' to each side of the equation.
x + 8y + -8y = 15 + -8y
Combine like terms: 8y + -8y = 0
x + 0 = 15 + -8y
x = 15 + -8y
Simplifying
x = 15 + -8y
Step-by-step explanation: