Answer:
5/4
Step-by-step explanation:
2 1/2=5/2
(5/2)(1/2)=5/4
Answer: 4
Step-by-step explanation:
i think
Answer:
![P(X\geq 3.4)=0.0228](https://tex.z-dn.net/?f=P%28X%5Cgeq%203.4%29%3D0.0228)
Step-by-step explanation:
Given the mean is 3.2, standard deviation is 0.8 and the sample size is 64.
-We calculate the probability of a mean of 3.4 as follows:
#First determine the z-value:
![z=\frac{\bar X -\mu}{\sigma/\sqrt{n}}\\\\=\frac{3.4-3.2}{0.8/\sqrt{64}}\\\\=2.000](https://tex.z-dn.net/?f=z%3D%5Cfrac%7B%5Cbar%20X%20-%5Cmu%7D%7B%5Csigma%2F%5Csqrt%7Bn%7D%7D%5C%5C%5C%5C%3D%5Cfrac%7B3.4-3.2%7D%7B0.8%2F%5Csqrt%7B64%7D%7D%5C%5C%5C%5C%3D2.000)
#We then determine the corresponding probability on the z tables:
![Z(X\geq 3.4)=1-P(X](https://tex.z-dn.net/?f=Z%28X%5Cgeq%203.4%29%3D1-P%28X%3C3.4%29%5C%5C%5C%5C%3D1-0.97725%5C%5C%5C%5C%3D0.0228)
Hence, the probability of obtaining a sample mean this large or larger is 0.0228
Answer:
infinity
Step-by-step explanation:
you can change x and then every answer will be different
Answer: x = 0; y = 2; z = 5
Step-by-step explanation:
x+2y+z=9
x-y+3z=13
2z=10
==
Start with the last equation: 2z = 10, therefore z = 5 [easy]
Let's rewrite the second equation with 1) z=5, and 2) rearrange to find x:
x-y+3z = 13
x - y +3*5 = 13
x = y-2
Now use the values for x [(y-2)] and y [5] in the first equation:
X+2y+z=9
(y-2) +2y + 5 = 9
3y +3 = 9
3y = 6
y = 2
Now that we have y [2] and z [5], let's use the first equation to solve for x:
x+2y+z=9
x + 4 + 5 = 9
x + 9 = 9
x = 0
====
Try the three values (x=0, y=2, and z=5) in any of the formulas. The result should/will equal the number shown.