For the following procedure, let's assume your polygon layer is called Po_lyr and your point layer is called pt_lyr.

Method 1:

• Load the Po_lyr and pt_lyr into Qgis
• CLick on Vector -> Analysis tools -> Points in Polygon
• Load the po_lyr on top and the pt_lyr in the point layer selection menu
• Specify where you want the file to be saved
• Add the new layer to the map
• Right click on the map's name and chose Open Attributes
• The results should be there

Method 2:

• Load the Po_lyr and pt_lyr into Qgis
• CLick on Vector -> Geoprocessing Tools -> Intersect
• In the window that appears, the input layer is pt_lyr and the intersect layer is po_lyr
• Save the output shape file as result_pt_in_poly.shp
• Load that layer to to QGIS
• Right click on the layer again and click on Attribute Table
• At this point you can output the table to a spreadsheet and do the math there since for every point, you'll have the ID of the polygon in every point layer.
• If you want to still continue using QGIS, then I assume you'll have to use python console for that but someone here can correct me

For the following procedure, let's assume your polygon layer is called Po_lyr and your point layer is called pt_lyr.

Method 1:

• Load the Po_lyr and pt_lyr into QGIS
• CLick on Vector -> Analysis tools -> Points in Polygon
• Load the po_lyr on top and the pt_lyr in the point layer selection menu
• Specify where you want the file to be saved
• Add the new layer to the map
• Right click on the map's name and chose Open Attributes
• The results should be there

Method 2:

• Load the Po_lyr and pt_lyr into QGIS
• CLick on Vector -> Geoprocessing Tools -> Intersect
• In the window that appears, the input layer is pt_lyr and the intersect layer is po_lyr
• Save the output shape file as result_pt_in_poly.shp
• Load that layer to to QGIS
• Right click on the layer again and click on Attribute Table
• At this point you can output the table to a spreadsheet and do the math there since for every point, you'll have the ID of the polygon in every point layer.
• If you want to still continue using QGIS, then I assume you'll have to use python console for that but someone here can correct me

For the following procedure, let's assume your polygon layer is called Po_lyr and your point layer is called pt_lyr.

Method 1:

• Load the Po_lyr and pt_lyr into Qgis
• CLick on Vector -> Analysis tools -> Points in Polygon
• Load the po_lyr on top and the pt_lyr in the point layer selection menu
• Specify where you want the file to be saved
• Add the new layer to the map
• Right click on the map's name and chose Open Attributes
• The results should be there

Method 2:

• Load the Po_lyr and pt_lyr into Qgis
• CLick on Vector -> Geoprocessing Tools -> Intersect
• In the window that appears, the input layer is pt_lyr and the intersect layer is po_lyr
• Save the output shape file as result_pt_in_poly.shp
• Load that layer to to QGIS
• Right click on the layer name in the canvas and press on Toggle Editing
• Right click on the layer again and click on Attribute Table
• At this point you can output the table to a spreadsheet and do the math there since for every point, you'll have the ID of the polygon in every point layer.
• If you want to still continue using QGIS, then I assume you'll have to use python console for that but someone here can correct me

For the following procedure, let's assume your polygon layer is called Po_lyr and your point layer is called pt_lyr.

Method 1:

• Load the Po_lyr and pt_lyr into Qgis
• CLick on Vector -> Analysis tools -> Points in Polygon
• Load the po_lyr on top and the pt_lyr in the point layer selection menu
• Specify where you want the file to be saved
• Add the new layer to the map
• Right click on the map's name and chose Open Attributes
• The results should be there

Method 2:

• Load the Po_lyr and pt_lyr into Qgis
• CLick on Vector -> Geoprocessing Tools -> Intersect
• In the window that appears, the input layer is pt_lyr and the intersect layer is po_lyr
• Save the output shape file as result_pt_in_poly.shp
• Load that layer to to QGIS
• Right click on the layer again and click on Attribute Table
• At this point you can output the table to a spreadsheet and do the math there since for every point, you'll have the ID of the polygon in every point layer.
• If you want to still continue using QGIS, then I assume you'll have to use python console for that but someone here can correct me