To do this quickly. Select the heading of the column you want to count. Go to 'Data' then 'Filter' then 'AutoFilter'.
Then click on the arrow in the heading for that column and choose 'Customs' from the drop down.
Set your parameters (so greaterthat 90 and less than 200).
Then it will only show these results. At this point, go to the cell a couple down from the bottom of the list, and goto 'Insert', then 'Function' Choose 'COUNTA' and select the cells in the column that have values in (except the header row).
Should work fine. Only point is that when you are doing the custom filter you can only pick numbers from your list, so if there is no 90 or 200 in it you will have to pick the nearest number.