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

time in hoursnumber of germinated seeds
120
242
3617
4811
6038
7217
841
960
1081
1201
1320
1440
1560
1680
1801
1920

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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
 

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BGY23

Well-known Member
Joined
Aug 13, 2008
Messages
515
Hours in col E Seeds in F


=SUMPRODUCT(E3:E18,F3:F18)/SUM(F3:F18)
 

nisidotatos

New Member
Joined
Jun 16, 2015
Messages
2
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
4.3464E+28

.......



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