How to test value is in range

Please help , this must be so easy but Ive read so much ive confused myself
I have a column of figures in E3 to E20
I want to count how many fall between certain ranges

ie
0 – 19
20- 39
40 – 49
50 – 100

what is the formula in libre office 3 . its so easy in excel so must be easy on here as well ?

I think FREQUENCY() function is a good choice.

https://help.libreoffice.org/Calc/Array_Functions#FREQUENCY