Calculate value for a Logistic growth model

[devpp]

Help Needed,
I need to calculate the population values based on the logistic growth model.
I do not know the growth rate.
The values which I have are
The value on week 0 is 0.7 (i.e. 70%) and the value on
week 15 is 1 (i.e 100%).
It grows week by week.

Can anyone help me on how to do this?

Thanks,
Devpp

 

[devpp]

Logistic growth calculation

Hi,
I have a graph in which the curve starts from population of 70% and ends at 100%.
Its plotted against time which is in weeks (from week 1 to week 16).
I dont know the growth rate and I dont know how to find the inbetween population values.
Can anyone tell me how to do this.
Know values are
First population value 70%
Final population value 100%
Time span is 1 to 16 weeks.

My assumption about logistic growth is that the growth is maximum in the beginning and decreases slowly.

Can anyone help me on this?