How to solve these?

[annieare]

1. A large employer is interested in determining what proportion of employees are not at work on a given day. A preliminary accounting of absences shows 1.15% of employees are absent on a specific day. The employer wants to be 90% confident in the estimate with an error of 0.002. How many employees need to be observed to collect the information about absences?

2. A large bag of peanut M&M's has a mean number of 358 pieces, with a standard deviation of 50. If you sample 100 bags of M&M's, what is the probability you will have between 35,000 and 36,000 pieces? Hint: use Central Limit Theorem for Sums

3. College students taking a full-time load also work an average of 28 hours per week, with a standard deviation of 3.05 hours. What proportion of students work more than 35 hours per week?

4. College students taking a full-time load also work an average of 25 hours per week, with a standard deviation of 3.15 hours. What proportion of students work between 22 and 30 hours per week?

 

[Deleted member 4993]

A large employer is interested in determining what proportion of employees are not at work on a given day. A preliminary accounting of absences shows 1.15% of employees are absent on a specific day. The employer wants to be 90% confident in the estimate with an error of .002. How many employees need to be observed to collect the information about absences.





A large bag of peanut M&M's has a mean number of 358 pieces with a standard deviation of 50. If you sample 100 bags of M&M's what is the probability you will have between 35,000 and 36,000 pieces?

Hint: use Central Limit Theorem for Sums



College students taking a full time load also work an average of 28 hours per week with a standard deviation of 3.05 hours. What proportion of students work more than 35 hours per week?



College students taking a full time load also work an average of 25 hours per week with a standard deviation of 3.15 hours. What proportion of students work between 22 and 30 hours per week?

What are your thoughts?

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[annieare]

What are your thoughts?

Please share your work with us ...even if you know it is wrong

If you are stuck at the beginning tell us and we'll start with the definitions.

You need to read the rules of this forum. Please read the post titled "Read before Posting" at the following URL:

http://www.freemathhelp.com/forum/th...Before-Posting

I did read, but These are basic questions from a new chapter that I'm trying to figure out how to work so I can figure out the rest. I'm doing the course online and it's difficult for me.

 

[stapel]

I did read, but These are basic questions from a new chapter that I'm trying to figure out how to work so I can figure out the rest. I'm doing the course online and it's difficult for me.

Your book (in addition to whatever online materials were provided by your school, and the online lessons you've tried to study) already gave you plenty of worked examples. If a few worked examples were sufficient to explain this chapter to you, then you wouldn't be posting here.

If you're saying that you have no instructor, don't understand the book (or online lessons), and need to learn the background material first, then you'll need to consider hiring a qualified local tutor who can provide you with the private lessons you seek. (The volunteers here can help with specific exercises, but we cannot teach courses within this environment.) Otherwise, please reply showing your thoughts and efforts so far. Thank you!