We are given the following data:
Sample Size = n = 1000
Sample Mean = u = 15 hours
Population Standard Deviation = s = 2 hours
Since we know the population standard deviation, we can use z distribution to find the confidence interval about the mean. z value for 95% confidence interval is 1.96.
Formula for the confidence interval is:

Using the values in the formula, we get:

Therefore, the 95% confidence interval about the population mean is 14.88 hours to 15.12 hours. So B option is the correct answer.
Answer:
h
Step-by-step explanation:
square root of 260 is 16.1 therefore h is the closest
The answer is 100. I hope this helps!
<span>The equation is: 4x + y + a = 0
Point (4, -3) </span>⇒ x = 4 and y = - 3<span>
</span>⇒ 4 · 4 - 3 + a = 0
<span>
16 - 3 +a = 0
13 + a = 0
a = -13
</span>Ansver: equation is: 4x + y - 13 = <span>0 OR 4x + y = 13
</span>
Answer:
see explanation
Step-by-step explanation:
Using the rules of exponents
= 
= ![\sqrt[n]{a^{m} }](https://tex.z-dn.net/?f=%5Csqrt%5Bn%5D%7Ba%5E%7Bm%7D%20%7D)
Given

= 
= ![\frac{1}{\sqrt[b]{y^{a} } }](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B%5Csqrt%5Bb%5D%7By%5E%7Ba%7D%20%7D%20%7D)