Help with the formula for mean germination time

nisidotatos

New Member
Joined
Jun 16, 2015
Messages
2
Hello guys, we are doing at college an experiment with the germination of some seeds.
We have generated some date and would like to calculate the mean germination time with excel.
THe formula for that is

  • MGT= ∑(T1*n1 + T2*n2 +…+ Tk*nk)/∑(n1 + n2 +…+nk)
where - n= no. of new germinated seed, T= time from the beginning of the experiment

[TABLE="width: 500"]
<tbody>[TR]
[TD][/TD]
[TD]time in hours[/TD]
[TD]number of germinated seeds[/TD]
[/TR]
[TR]
[TD][/TD]
[TD]12[/TD]
[TD]0[/TD]
[/TR]
[TR]
[TD][/TD]
[TD]24[/TD]
[TD]2[/TD]
[/TR]
[TR]
[TD][/TD]
[TD]36[/TD]
[TD]17[/TD]
[/TR]
[TR]
[TD][/TD]
[TD]48[/TD]
[TD]11[/TD]
[/TR]
[TR]
[TD][/TD]
[TD]60[/TD]
[TD]38[/TD]
[/TR]
[TR]
[TD][/TD]
[TD]72[/TD]
[TD]17[/TD]
[/TR]
[TR]
[TD][/TD]
[TD]84[/TD]
[TD]1[/TD]
[/TR]
[TR]
[TD][/TD]
[TD]96[/TD]
[TD]0[/TD]
[/TR]
[TR]
[TD][/TD]
[TD]108[/TD]
[TD]1[/TD]
[/TR]
[TR]
[TD][/TD]
[TD]120[/TD]
[TD]1[/TD]
[/TR]
[TR]
[TD][/TD]
[TD]132[/TD]
[TD]0[/TD]
[/TR]
[TR]
[TD][/TD]
[TD]144[/TD]
[TD]0[/TD]
[/TR]
[TR]
[TD][/TD]
[TD]156[/TD]
[TD]0[/TD]
[/TR]
[TR]
[TD][/TD]
[TD]168[/TD]
[TD]0[/TD]
[/TR]
[TR]
[TD][/TD]
[TD]180[/TD]
[TD]1[/TD]
[/TR]
[TR]
[TD][/TD]
[TD]192[/TD]
[TD]0[/TD]
[/TR]
[TR]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
</tbody>[/TABLE]

So if i wanted to calculate the MGT in the cell below the numbers of germinated seeds how could i write this formula so that excel would accept it?

Best regards
Panos
 
hello again,
i am trying with this formula : =SUMPRODUCT(B8:C8,B9:C9,B10:C10,B11:C11,B12:C12,B13:C13,B14:C14,B15:C15,B16:C16,B17:C17,B18:C18,B19:C19,B20:C20,B21:C21,B22:C22,B23:C23)/SUM(C8:C23)
but i dont get a number. all i get is [TABLE="width: 102"]
<tbody>[TR]
[TD="width: 102, align: right"]4.3464E+28

.......


[/TD]
[/TR]
</tbody>[/TABLE]
 
Upvote 0

We've detected that you are using an adblocker.

We have a great community of people providing Excel help here, but the hosting costs are enormous. You can help keep this site running by allowing ads on MrExcel.com.
Allow Ads at MrExcel

Which adblocker are you using?

Disable AdBlock

Follow these easy steps to disable AdBlock

1)Click on the icon in the browser’s toolbar.
2)Click on the icon in the browser’s toolbar.
2)Click on the "Pause on this site" option.
Go back

Disable AdBlock Plus

Follow these easy steps to disable AdBlock Plus

1)Click on the icon in the browser’s toolbar.
2)Click on the toggle to disable it for "mrexcel.com".
Go back

Disable uBlock Origin

Follow these easy steps to disable uBlock Origin

1)Click on the icon in the browser’s toolbar.
2)Click on the "Power" button.
3)Click on the "Refresh" button.
Go back

Disable uBlock

Follow these easy steps to disable uBlock

1)Click on the icon in the browser’s toolbar.
2)Click on the "Power" button.
3)Click on the "Refresh" button.
Go back
Back
Top