Numpy normal distribution within a range without standart deviation value

I have to generate random values from an interval for a machine learning task. I want to have a normal distribution within a range in numpy and I searched on web for it. I found this question How to get a normal distribution within a range in numpy? but I don't have any column for standart deviation.

The values are like this :

−21.8 ± 6.7
−4.3 ± 0.1
−7.4 ± 0.5

So I know minimum value and maximum value. But there is nothing about standart deviation.

Thanks.