Rutherford Gold Leaf Experiment -expected vs observed results AQA A-Level Physics

What on earth were the expected vs observed results of the gold leaf experiment? I keep googling and getting different answers and it's driving me nuts.
Currently what I'm concluding is that he expected the alpha particles to pass through and get a little deflected, but instead most of them did that, with a fraction of them deflected massive angles / bouncing back. But why did he expect them to pass straight through in the first place if the plum pudding model stated that the atoms were solid - surely he would've thought they'd all bounce back off a solid surface??
Please help, it's making me rage