Math Question

[levyusupov]

---

Members don't see this ad.

the avarage salary for dentist is 70000. if the standart deviation is 20000, what is the percantage of finding a person who erns 110000?

 

[Donjuan]

Somebody get Streetwolf up in here quickly, we have a code blue! 🙂

- Donjuan

 

[eleanor_rigby]

Wouldn't it be around 5% using the 68-95-99.7 rule since $110,000 is (mean + 2sigma)?

 

[littlemissy]

the avg salary of a dentist is not 70k. go to the ada or dentaltown

 

[Streetwolf]

Somebody get Streetwolf up in here quickly, we have a code blue! 🙂

- Donjuan

Sorry I was doing waxups all damn afternoon. And a f^@$ing cricket woke me up last night at 6am and I couldn't fall back asleep. I'm tired. Luckily it was in the middle of my room when I got home and I got to use my hammer.

Anyhow.

I'm assuming the problem is $110,000+. I'm also assuming the data points have a normal distribution.

eleanor_rigby was 90% correct. It's 2 std devs up from the mean, and 95% of the data lies inbetween 2 std devs of the mean according to the 68-95-99.7 rule. So 5% of the population lies outside of 2 std devs. But we only need the right end of the population which is 2.5%.

Answer is 2.5%.

 

[Electrons]

Let me get this straight, so if 110000 is right on spot between top 2nd and 3rd std, we should consider that outside or belonging to the 3rd std?

 

[Streetwolf]

110,000 is EXACTLY 2 std devs from the mean. It isn't in between. The question asked about dentists making (at least) 110,000 which means that amount and above. So basically it wants to know the percentage of dentists making above a salary which is 2 std devs away from the mean salary.

 

[Donjuan]

Sorry I was doing waxups all damn afternoon. And a f^@$ing cricket woke me up last night at 6am and I couldn't fall back asleep. I'm tired. Luckily it was in the middle of my room when I got home and I got to use my hammer.

Anyhow.

I'm assuming the problem is $110,000+. I'm also assuming the data points have a normal distribution.

eleanor_rigby was 90% correct. It's 2 std devs up from the mean, and 95% of the data lies inbetween 2 std devs of the mean according to the 68-95-99.7 rule. So 5% of the population lies outside of 2 std devs. But we only need the right end of the population which is 2.5%.

Answer is 2.5%.

Can you please explain this rule to me again please, thanks. I took statistics like almost five years ago, and don't recall learning this rule! Its times like this that I wish I saved my stats notes.

 

[Solstica]

Can you please explain this rule to me again please, thanks. I took statistics like almost five years ago, and don't recall learning this rule! Its times like this that I wish I saved my stats notes.

http://en.wikipedia.org/wiki/68-95-99.7_rule

 

[Donjuan]

http://en.wikipedia.org/wiki/68-95-99.7_rule

Cool, never would've thought wiki actually has that, maybe I typed in a wrong word, thanks a lot, & good luck

- Donjuan

 

[rose786]

Sorry I was doing waxups all damn afternoon. And a f^@$ing cricket woke me up last night at 6am and I couldn't fall back asleep. I'm tired. Luckily it was in the middle of my room when I got home and I got to use my hammer.

Awww. Poor cricket. You could've let him outside.

 

[Streetwolf]

Awww. Poor cricket. You could've let him outside.

No. I've freed about 15 crickets since I moved in a month ago (there's just so damn many of them in this area of Long Island). Those were not in my room.

My room = instant death. Unless I left the door open and it hops in here while I'm chasing it haha. Anywhere else and I'll toss it out the front door.

 

[rose786]

No. I've freed about 15 crickets since I moved in a month ago (there's just so damn many of them in this area of Long Island). Those were not in my room.

My room = instant death. Unless I left the door open and it hops in here while I'm chasing it haha. Anywhere else and I'll toss it out the front door.

Ah well. 'tis the circle of life, survival of the fittest, etc.

 

[Electrons]

No. I've freed about 15 crickets since I moved in a month ago (there's just so damn many of them in this area of Long Island). Those were not in my room.

My room = instant death. Unless I left the door open and it hops in here while I'm chasing it haha. Anywhere else and I'll toss it out the front door.

What was the standard deviation of finding the local population being wiped out by a giant? 🙂