Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

Pages: **1**

**mathaholic****Member**- From: Earth
- Registered: 2012-11-29
- Posts: 3,020

Since Euler Avenue is a little inactive, let's give life to it:

Okay, so I'll start from showing you some examples of the standard deviation, and not gonna teach you, but I just want you to correct me in case of my mistakes in calculation.

**Note: I will use the whole population for these examples.**

**1.** 62, 35, 17, 27 and 59

62+35+17+27+59

97+44+59

103+97

200

200 / 5 = 40

62 - 40 = 22

35 - 40 = -5

17 - 40 = -23

27 - 40 = -13

59 - 40 = 19

22 ^ 2 = 484

5 ^ 2 = 25

17 ^ 2 = 289

27 ^ 2 = 729

59 ^ 2 = 3481

484+25+289+729+3481

509+1018+3481

4499+509

5008

5008 / 5 = 1,001.6 ~ 1,002

(sqrt)1,002 = 31.65 ~ **32**

Mathaholic | 17th most active poster | 681st most recent person to join MIFF | Person | rrr's classmate

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 98,926

Hi mathaholic;

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **Thinking is cheating.**

Offline

**mathaholic****Member**- From: Earth
- Registered: 2012-11-29
- Posts: 3,020

Why you don't get it? It's just step by step anyways.

Mathaholic | 17th most active poster | 681st most recent person to join MIFF | Person | rrr's classmate

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 98,926

I meant I do not think that is the right answer.

22 ^ 2 = 484

5 ^ 2 = 25

17 ^ 2 = 289

27 ^ 2 = 729

59 ^ 2 = 3481

Please check that.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **Thinking is cheating.**

Offline

**mathaholic****Member**- From: Earth
- Registered: 2012-11-29
- Posts: 3,020

It's correct!

Mathaholic | 17th most active poster | 681st most recent person to join MIFF | Person | rrr's classmate

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 98,926

Hi;

You are squaring the wrong numbers.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **Thinking is cheating.**

Offline

**mathaholic****Member**- From: Earth
- Registered: 2012-11-29
- Posts: 3,020

*slaps myself*

Offline

Pages: **1**