SOLUTION: Will try again I asked this question on 4/24 none ever seems to answer questions here... A college has 25,000 students, of whom 10000 are older than 25. The registrar draws a simp

Question 1078704: Will try again I asked this question on 4/24 none ever seems to answer questions here...
A college has 25,000 students, of whom 10000 are older than 25. The registrar draws a simple random sample of 400 students.
The expected value for the number of students in the sample who are older than 25 is _______________.
The standard error for the number of students in the sample who are older than 25 is ____________________________.
The expected value for the percentage of students in the sample who are older than 25 is _____________.
The standard error for the percentage of students in the sample who are older than 25 is ________________.
The percentage of students in the sample who are older than 25 will be around ____________, give or take ________________or so.
Found 2 solutions by Boreal, Alan3354:
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
probability is 0.4 that older than 25.
E(x)=400*0.4=160
using the SE below, and multiplying by 400, it is 9.8
E(x) for percentage is 40%
SE is sqrt (.4*.6/400)=0.02445 or 2.45%
Using a 95% interval, (0.352, 0.448), or for the answer, 40%, give or take 4.8%
mean is 160
sd is sqrt (variance)=sqrt (400*.4*.6)=96; sqrt (96)=9.8, which is what was shown above.

Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
No one answers a question here?
---
I've answered over 56,000.
Stanbon has answered 70,000 +.
Some other tutors have answered 10s of thousands.
=====================
If you're not happy, apply for a refund.
If that doesn't work, cry to your mommy.

RELATED QUESTIONS
9/3(6*4/8) = ?If you are a student, it is a wonderful place to get low-cost homework... (answered by aulii)
The admissions office at a Big State University needs to decide how many in state and... (answered by Theo)
Get homework help at www.aceyourcollegeclasses.com If you are a student, it is a... (answered by mathhelper123)
Get homework help at www.aceyourcollegeclasses.com If you are a student, it is a... (answered by mathhelper123)
A student guesses blindly on a 20-question multiple choice test. If each question has 4... (answered by stanbon)
Use the following situation to answer questions 3 through 6. Pick the one best answer... (answered by ewatrrr)
Here is the question: A survey asked 5851 random adults the question "How many... (answered by solver91311)
Do functions have to be even or odd, necessarily? i have this question here for a take... (answered by kev82)
Hello, my name is Rebecca Ghisoiu. I attend Western Govorners University, an online... (answered by Theo)