SUM or AVERAGE of mm:ss

I need help, I received link references from a corporate spreadsheet with 
time format 13:30 (representing mm:ss). I am trying to get at SUM and AVERAGE 
of these cells and having a hard time getting it right. I did try to have 
output format as [m]:ss and it is coming out incorrectly. If I have to 
convert these to h:mm:ss is there a way to make to conversion happen 
automatically.

Example:

20:12
5:31
9:47
8:45
8:27
7:25
20:21
17:46
13:01
22:17

SUM these to format [m]:ss will give me 15212:00
SUM these to format mm:mm will give me 32:00
AVERAGE these to format 13:30 will give me 1:21

Can someone explain what is Excel doing here and possible offer me a 
solution for AVERAGE these times.

Thanks,

Kha
0
KhaVu (6)
1/10/2006 12:18:01 AM
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Although these may look like minutes and seconds, I think Excel has
taken them as hours, minutes and seconds and is just displaying [h]:mm.
Click on one of the cells and check the format with Format | Cells |
Number (tab).

If this is the case, then in a blank column enter the formula:

=A1/60, assuming your times are in column A, and format as [m]:ss. Copy
this down.

You can fix the values using <copy> with Edit | Paste Special | Values
| OK, and you can also paste the fixed values to over-write the
original values. Hopefully, your SUM and AVERAGE formulae will work
after this.

Hope this helps.

Pete

0
pashurst (2576)
1/10/2006 12:33:53 AM
The cell format is actually Time>13:30

"Pete" wrote:

> Although these may look like minutes and seconds, I think Excel has
> taken them as hours, minutes and seconds and is just displaying [h]:mm.
> Click on one of the cells and check the format with Format | Cells |
> Number (tab).
> 
> If this is the case, then in a blank column enter the formula:
> 
> =A1/60, assuming your times are in column A, and format as [m]:ss. Copy
> this down.
> 
> You can fix the values using <copy> with Edit | Paste Special | Values
> | OK, and you can also paste the fixed values to over-write the
> original values. Hopefully, your SUM and AVERAGE formulae will work
> after this.
> 
> Hope this helps.
> 
> Pete
> 
> 
0
KhaVu (6)
1/10/2006 12:51:02 AM
Yes, if you do Format | Cells | Number (tab) then it shows Time with
13:30 - this means hours and minutes. Click on 13:30:55 (two down on
the list) and you should see your first value change to 20:12:00, in
which case it is formatted as I suggested and you can follow my
suggestions to rectify it.

Pete

0
pashurst (2576)
1/10/2006 1:13:17 AM
Now, I am really in trouble because I want them the be in mm:ss not hh:mm:ss 
i.e. the first number should be 0:20:12. Can you help with this? or another 
forum is needed here.

"Pete" wrote:

> Yes, if you do Format | Cells | Number (tab) then it shows Time with
> 13:30 - this means hours and minutes. Click on 13:30:55 (two down on
> the list) and you should see your first value change to 20:12:00, in
> which case it is formatted as I suggested and you can follow my
> suggestions to rectify it.
> 
> Pete
> 
> 
0
KhaVu (6)
1/10/2006 9:27:03 PM
Read the second part of my first posting, ie:

" ...
If this is the case, then in a blank column enter the formula:

=A1/60, assuming your times are in column A, and format as [m]:ss. Copy

this down.

You can fix the values using <copy> with Edit | Paste Special | Values
| OK, and you can also paste the fixed values to over-write the
original values. Hopefully, your SUM and AVERAGE formulae will work
after this.

Hope this helps. 
...."

And I hope this re-posting helps.

Pete

0
pashurst (2576)
1/11/2006 12:40:31 AM
Reply:

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