Cripes, thats a mental weather forecast
It's going to start dry, then almost certainly turn wet, almost certainly dry out, then it might rain again, and the end of the race will be dry... if it lasts over 90 minutes.
Two options really, fuel low (max 10 laps) and start on slicks, or fuel highish (too high and you'll enter the next dry part, probably about enough for a 2-stopper) and start on wets.
If you are usually doing awful in quali it might be worth fueling low and starting on slicks, you'll start higher on the grid and should gain time over at least some of the people you normally start around.
Apart from that, i'd go for starting on wets. You lose less time for wets on a dry track than vice versa, about 7s instead of 10s. Given that the weather normally changes about 5-8 laps in, thats about 35-60s lost, and you'd spend more than that pitting (and tyre type changes take longer).
Bit tricky to decide to go with a wet or a dry setup, given that it is basically 1/3 wet, 1/3 dry and 1/3 either, i'd say go with whatever type of tyres you start on.
Notes for rookies:
-Change your wait to pit to 0, you don't want to be around ages on the wrong tyres (its only worth doing when it will change weather right at the end of the race, but here you'd lose out in the middle stint so it isn't worth it, even if it rains when the forecast is 50-50)
-Over-fuel a bit, the fuel loads are fill to at stop, not add to tank, so if you pit earlier due to change of weather, you can end up having less fuel used than you intended.
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