Answer:
x=-6
Step-by-step explanation:
See the steps below:)
Answer:
(A) Mean = 84
(B) Variance = 118.714
(C) Standard deviation = 10.89
Step-by-step explanation:
Data provided:
number of observations, n = 15
sample of 15 costco customer satisfaction scores follow
X
![(X-\bar{X})^2](https://tex.z-dn.net/?f=%28X-%5Cbar%7BX%7D%29%5E2)
95 11 121
90 6 36
83 -1 1
64 -20 400
95 11 121
98 14 196
80 -4 16
83 -1 1
82 -2 4
93 9 81
86 2 4
80 -4 16
94 10 100
75 -9 81
62 -22 484
================================================
∑X = 1260 ∑= 1662
Now,
(A) Mean = ![\frac{\textup{Sum of all observations}}{\textup{Total number of observations}}](https://tex.z-dn.net/?f=%5Cfrac%7B%5Ctextup%7BSum%20of%20all%20observations%7D%7D%7B%5Ctextup%7BTotal%20number%20of%20observations%7D%7D)
or
Mean =
= 84
(B) Variance = ![\frac{\sum(X-\bar{X})^2}{n-1}](https://tex.z-dn.net/?f=%5Cfrac%7B%5Csum%28X-%5Cbar%7BX%7D%29%5E2%7D%7Bn-1%7D)
or
Variance = ![\frac{1662}{15-1}](https://tex.z-dn.net/?f=%5Cfrac%7B1662%7D%7B15-1%7D)
or
Variance = 118.714
(C) Standard deviation = √Variance = √118.714 = 10.89
Answer:
Area= base×height
7×18? 126
Step-by-step explanation:
The area of Ted’s patio is 126 ft.
Answer: 8^2 18^2
Step-by-step explanation: The way that you figure out the power is by multiplying the 4x2=8 than the 9x2=18 than you raise them both to the second power.