The answer is 7 because the mean is an average. So if you add up all the numbers and then divide that number by the amount of numbers listed then that will get you your answer which is 7
4+5+6+7+8+9+10=49
49/7=7
Answer:
The length of shadow is 69 foot.
Step-by-step explanation:
We are given a shadow of lighthouse.
Length of top of lighthouse to end of shadow is 90 ft.
Angle make at top of lighthouse is 50°
Distance from foot of lighthouse to end of shadow is x ft.
we need to find the length of shadow i,e x ft
Using trigonometry ration:
![\sin\theta=\dfrac{P}{H}](https://tex.z-dn.net/?f=%5Csin%5Ctheta%3D%5Cdfrac%7BP%7D%7BH%7D)
![\sin50^\circ=\dfrac{x}{90}](https://tex.z-dn.net/?f=%5Csin50%5E%5Ccirc%3D%5Cdfrac%7Bx%7D%7B90%7D)
![x=90\times 0.766](https://tex.z-dn.net/?f=x%3D90%5Ctimes%200.766)
![x=68.94\approx 69\text{ ft}](https://tex.z-dn.net/?f=x%3D68.94%5Capprox%2069%5Ctext%7B%20ft%7D)
Hence, The length of shadow is 69 foot.
Answer:
Option 2. h = E/mg.
Step-by-step explanation:
E= mgh
mgh = E
Divide both sides by mg:
mgh / mg = E / mg
h = E/mg.
Answer:
The 90% confidence interval using Student's t-distribution is (9.22, 11.61).
Step-by-step explanation:
Since we know the sample is not big enough to use a z-distribution, we use student's t-distribution instead.
The formula to calculate the confidence interval is given by:
Where:
is the sample's mean,
is t-score with n-1 degrees of freedom,
is the standard error,
is the sample's size.
This part of the equation is called margin of error:
We know that:
degrees of freedom
Replacing in the formula with the corresponding values we obtain the confidence interval:
![\bar{x}\pm t_{n-1} \times s/\sqrt{n} = 10.41 \pm 1.70 \times 3.71/\sqrt{28} = (9.22, 11.61)](https://tex.z-dn.net/?f=%5Cbar%7Bx%7D%5Cpm%20t_%7Bn-1%7D%20%5Ctimes%20s%2F%5Csqrt%7Bn%7D%20%3D%2010.41%20%5Cpm%201.70%20%5Ctimes%203.71%2F%5Csqrt%7B28%7D%20%3D%20%289.22%2C%2011.61%29)
Answer:
$50 - $9.99 = $40.01
$40.01 ÷ $3.99 = 10
so the answer is 10
Step-by-step explanation:
if thats not whats being asked sorry