Answer:
5.8 cm fabric is left
Step-by-step explanation:
Fabric bought = 8.6 cm
Used fabric to make pillow = 2.8 m
We need to find the amount of left fabric.
Left fabric = total fabric - used fabric
= 8.6 cm - 2.8 cm
= 5.8 cm
Hence, 5.8 cm fabric is left.
Answer:
There is a decreasing pattern the farther they are the less likely hit the target.
Step-by-step explanation:
Answer:
D=10
Step-by-step explanation:
38=3d -(-8)
38=3d+8
38-8=3d+(8-8)
30=3d
30/3=3d/3
10=d
=3d+
C. The demand for gasoline will be unaffected and the effect in supply is uncertain
Answer:
Step-by-step explanation:
Data given
20 13 21 18 19 22 19 15 12 12 18 21
We can calculate the sample mean and deviation with the following formulas:
![\bar X =\frac{\sum_{i=1}^n X_i}{n}](https://tex.z-dn.net/?f=%5Cbar%20X%20%3D%5Cfrac%7B%5Csum_%7Bi%3D1%7D%5En%20X_i%7D%7Bn%7D)
![s= \sqrt{\frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}}](https://tex.z-dn.net/?f=s%3D%20%5Csqrt%7B%5Cfrac%7B%5Csum_%7Bi%3D1%7D%5En%20%28X_i%20-%5Cbar%20X%29%5E2%7D%7Bn-1%7D%7D)
And we got:
represent the sample mean
population mean (variable of interest)
s=3.61 represent the sample standard deviation
n=12 represent the sample size
Confidence interval
The confidence interval for the mean is given by the following formula:
(1)
The degrees of freedom are given by:
Since the Confidence is 0.90 or 90%, the significance is
and
, the critical value would be given by
Now we have everything in order to replace into formula (1):