Answer: C. 12.5
Step-by-step explanation:
Given : A manufacturer of new light bulbs claims the average lifetime of its long-life bulb is more than 4000 hours.
Population mean : ![\mu=4000](https://tex.z-dn.net/?f=%5Cmu%3D4000)
Sample size : n= 100
Sample mean : ![\overline[x}=4500](https://tex.z-dn.net/?f=%5Coverline%5Bx%7D%3D4500)
Standard deviation: ![s=400](https://tex.z-dn.net/?f=s%3D400)
The value of test-statistic is given by :-
![z=\dfrac{\overline{x}-\mu}{\dfrac{s}{\sqrt{n}}}\\\\\Rightarrow\ z=\dfrac{4500-4000}{\dfrac{400}{\sqrt{100}}}\\\\\Rightarrow\ z= 12.5](https://tex.z-dn.net/?f=z%3D%5Cdfrac%7B%5Coverline%7Bx%7D-%5Cmu%7D%7B%5Cdfrac%7Bs%7D%7B%5Csqrt%7Bn%7D%7D%7D%5C%5C%5C%5C%5CRightarrow%5C%20z%3D%5Cdfrac%7B4500-4000%7D%7B%5Cdfrac%7B400%7D%7B%5Csqrt%7B100%7D%7D%7D%5C%5C%5C%5C%5CRightarrow%5C%20z%3D%2012.5)
Hence, the value of the test statistic for this problem is 12.5.
Answer:
52
Step-by-step explanation:
55 - 3 = 52
give me brainiest wink wink
Answer:
2,880
Step-by-step explanation:
V = L (length) × H (height) × W (width)
V = 24×8×15 = 2,880 square inches
Hello!
Since we know how much they walked in 4/9 of an hour, we will divide 4/5 by 4/9 to get 4/9 to one.
![\frac{4}{5}](https://tex.z-dn.net/?f=%20%5Cfrac%7B4%7D%7B5%7D%20)
÷
![\frac{4}{9}](https://tex.z-dn.net/?f=%20%5Cfrac%7B4%7D%7B9%7D%20)
=
![\frac{36}{20} = \frac{9}{5}](https://tex.z-dn.net/?f=%20%5Cfrac%7B36%7D%7B20%7D%20%3D%20%20%5Cfrac%7B9%7D%7B5%7D%20%20)
They went 1 4/5 mph or
1.8 mph.
I hope this helps!
<span>The radius of a sphere join refers to the (D) the center and a point on the sphere. A radius is the distance of the center point to any sides of the circle or sphere. The point on the sphere can be anywhere. The center and a point on the sphere forms a sphere join.</span>