The answer is B for this problem
Answer: A. 664
Step-by-step explanation:
Given : A marketing firm is asked to estimate the percent of existing customers who would purchase a "digital upgrade" to their basic cable TV service.
But there is no information regarding the population proportion is mentioned.
Formula to find the samples size , if the prior estimate to the population proportion is unknown :
![n=0.25(\dfrac{z*}{E})^2](https://tex.z-dn.net/?f=n%3D0.25%28%5Cdfrac%7Bz%2A%7D%7BE%7D%29%5E2)
, where E = Margin of error.
z* = Two -tailed critical z-value
We know that critical value for 99% confidence interval =
[By z-table]
Margin of error = 0.05
Then, the minimum sample size would become :
![n=0.25(\dfrac{2.576}{0.05})^2](https://tex.z-dn.net/?f=n%3D0.25%28%5Cdfrac%7B2.576%7D%7B0.05%7D%29%5E2)
Simplify,
![n=0.25\times2654.3104=663.5776\approx664](https://tex.z-dn.net/?f=n%3D0.25%5Ctimes2654.3104%3D663.5776%5Capprox664)
Thus, the required sample size= 664
Hence, the correct answer is A. 664.
Answer: Has one solution X=0.
Please mark brainlest!
Explanation: Got it right on Edge!
A nickel = 5 cents = $0.05
A dime = 10 cents = $0.10
Let the number of nickels be x and the number of dimes be y, then
0.05x + 0.1y = 1.6
5x + 10y = 160 . . . (1)
x = y + 11 . . . (2)
Putting (2) into (1) gives\
5(y + 11) + 10y = 160
5y + 55 + 10y = 160
15y = 160 - 55 = 105
y = 105/15 = 7
x = 7 + 11 = 18
Therefore, He has 18 nickels and 7 dimes.
Answer:
he got 8 books free and now has 24 books total
Step-by-step explanation:
16/2=8
that would be the answer for how many books he got for free because if there is a box of 16 books and for every2 books you get one free then you would divide 16 and 2 and get 8 then
16+8=24
add the number of books he got for free with the original 16 books he already had and get 24 total books.