Insert a value after analyzing 2 cells

Good afternoon,

I have a sheet that will check in column J. When another box is ticked in column E, I would like the sheet to check if column J is checked and, in the box I, affirmative, inserts the value 1.5 in column F. the checkbox in J is unchecked. I would like the value of 3 to be placed in column F instead. I tried to write this myself and I failed, so I thought I would ask the experts 🙂

Thanks in advance