Answer:
160 - 2
120 - 1 1/2
240 - 3
Step-by-step explanation:
80 km driven every hour
Answer:
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 lifetime for a TV 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 like this:
And in order to find these probabilities we can use tables for the normal standard distribution, excel or a calculator.
Answer: Third Option
-2
Step-by-step explanation:
I want to find the minimum value of a function with the form
![y = asin (x-c)](https://tex.z-dn.net/?f=y%20%3D%20asin%20%28x-c%29)
But we do not know the value of the coefficient "a", which is the amplitude, nor of the constant c.
However, in the attached graph we have the function.
The minimum value of a function is the lowest value of the variable y that the function can reach.
Observe in the graph that the function is periodic and reaches its maximum value at
and its minimum value at ![y = -2](https://tex.z-dn.net/?f=y%20%3D%20-2)
Therefore the minimum value would be ![y = -2](https://tex.z-dn.net/?f=y%20%3D%20-2)