Intervall of Orderings

[#1]

Hello,

i have great problem. I waste a lot of time, but i have found no solution.

I have a table with oders and amount

Orders	Count of Orders
No. of Orders	60
of which < 150 €	20
of which 150 € - 500 €	30
of which > 500 €	10

Could anybody help me, how I solve this problem.

Thank you for helping me.