Plot charts with time as x axis

I have dates tagged to my data points but when i try to create a line chart with said datapoints it does not plot wrt time(xaxis). instead it just shows 1x data point 

this is what i am trying to achieve:

*excuse my horrendous drawing*

Erik Brzozowski wrote:

Check out this post:


Is this applicable for mobile development?


I've managed to do this,

However i want the %passrate to average out.

Currently my datapoints have 1 wrong and 2 right.

However as you can see it goes from 66% to 33%

Whereas it should had went from 50% to 66%.

Abv image shows my settings