Answer
$f(x)=\displaystyle \frac{7.2}{1+2.4(1.04)^{-x}}$
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Work Step by Step
In desmos.com, we add a table with variables $x_{1}$ and $y_{1}$ and enter the given points.
In the next free cell we enter
$y_{1}\sim N/(1+Ab^{-x_{1}})$
and the calculator returns
$N=7.19$: we round to $7.2$
$A=2.421$: we round to $2.4$
$b=1.04453$: we round to $1.04$
$f(x)=\displaystyle \frac{7.2}{1+2.4(1.04)^{-x}}$
