Continuous random variable and normal distribution

When a variable can take any value in an interval (height, weight, time), probability is calculated as an area under a curve, and the probability of an exact value is zero. The most important curve is the bell of the normal distribution $N(\mu ,\sigma )$, which describes heights, weights, measurement errors and many real quantities. In the IB exam almost everything is done with the graphic display calculator: calculating a probability given the limits, or the reverse, finding the value that leaves a given probability. The decisive thing is to draw the bell and shade the area you are asked about before typing anything.

Recommended order

Follow the sections in order: continuous random variable and density function, the normal distribution and normal calculations. At the end you have the IB exam questions grouped by type.