Step-by-step explanation:
1.before starting first collect the like terms.
5(2x+1)=10x
the like terms are 10x and 2x
2. 5+1=10x-2x because the 2x us crosing the equality sign
that is
6=8
Answer:
Step-by-step explanation:
W2 - 2w + 3
Putting value when w = 5
(5)2 - 2(5) + 3
25 - 10 + 3
18
Answer:
Where and
So then we can find in the normal standard distribution or in excel a value of Z who accumulates 0.25 of the area below and 0.75 of the area above. We can use the following excel code for example:
="NORM.INV(0.25,0,1)"
And we got = z= -0.674.
So the value of height that separates the bottom 25% of data from the top 75% is -0.674 °C.
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 readings at freezing of a population, and for this case we know the distribution for X is given by:
Where and
So then we can find in the normal standard distribution or in excel a value of Z who accumulates 0.25 of the area below and 0.75 of the area above. We can use the following excel code for example:
="NORM.INV(0.25,0,1)"
And we got = z= -0.674.
So the value of height that separates the bottom 25% of data from the top 75% is -0.674 °C.
..........The answer is B