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

You are not logged in.

- Topics: Active | Unanswered

**Lyndamurphy****Member**- Registered: 2006-05-11
- Posts: 1

I know this sounds stupid but I have forgotten how to calculate estimated numbers.

I have a monthly total and want to estimate over 3 months

The formula I have used is divided 3 months by the Total months figures

example

month total of 85/3 = 28.3

Is this correct

Many thanks

Offline

**Patrick****Real Member**- Registered: 2006-02-24
- Posts: 1,005

So is the sum of the three months totals 85 (for example 20+30+35), and you wonna find the average total per month? If that's what you want to do, then yes.. This should be in the help me section btw..

Support MathsIsFun.com by clicking on the banners.

What music do I listen to? Clicky click

Offline

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,582

We aren't entirely clear on your question, but I will answer this line:

Lyndamurphy wrote:

I have a monthly total and want to estimate over 3 months

If you have just one month and want to estimate for 3 months, the easiest way is to multiply by 3.

Example: April=60, so April, May and June together can be estimated to be 60×3=180

More accurately you would consider the number of days in each month. Since April has 30, May has 31, and June has 30, you would calculate as follows: Daily Average in April = 60/30 = 2, so estimate for the three months = 2×(30+31+30) = 182

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

Offline

**George,Y****Member**- Registered: 2006-03-12
- Posts: 1,306

yes the formula you use is correct

for

85/3 +85/3 +85/3 = 85

1st mon 2nd mon 3rd mon 3months altogether

**X'(y-Xβ)=0**

Offline