Let X be a continuous random variable with the probability distribution function f(x) and the cumulative distribution function F(x). Assume that F(0)=P(X<0)=0.2, F(1)=P(X<1)=0.5, and F(2.2)=P(X<2.2)=0.7.
What is the probability that X will lie between 1 and 2.2? (1 dp)