Answer:
20
Step-by-step explanation:
Let the number be "x":
Equation::
14 = 0.70x
x = 14/0.7
x = 20
Answer:
Step-by-step explanation:
We know that the vertex(lowest point) of is .
By inspection, we can see that the vertex of the graph is .
So, the lowest point of is , which means
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 value of x from the equation is 1
Given the equation 2x + 1 = 3
We are to find the value of x as shown:
Step 1: Subtract 1 from both sides
2x + 1 - 1 = 3 - 1 (Subtraction property of equality)
2x = 2
Step 2: Divide both sides by 2:
2x/2 = 2/2 (Division property of equality)
x = 1
Hence the value of x from the equation is 1
Learn more here: brainly.com/question/2159099