Answer:
Step-by-step explanation:
For this case we have the following data given:
2.3 3.1 2.8
1.7 0.9 4.0
2.1 1.2 3.6
0.2 2.4 3.2
Since the data are assumedn normally distributed we can find the standard deviation with the following formula:
And we need to find the mean first with the following formula:
And replacing we got:
And then we can calculate the deviation and we got:
Answer:
Step-by-step explanation:
Answer:
The first friend
Step-by-step explanation:
Because if you distributed the 7 then you will also get 7x.
Answer:
x = 5
Step-by-step explanation:
These triangles are similar, so they are in proportion to each other. Because of this we can say (the lengths of the vertical sides) = (the lengths of the hypotenuses). If we solve by cross-multiplying the numbers and then dividing we get x = 5.
Determinant = b² - 4ac = (-10)² + 4*1*25 = 100 - 100 = 0
So it has 1 solution.
Answer is D