Mathematics 9709 · AS & A Level · Continuous random variables

Continuous random variables — practice question

The random variable $X$ satisfies $X \sim N(20, 49)$.

(main)[3]

Given that $P(X > k) = 0.25$, determine the value of $k$.

Worked solution & mark scheme

This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Applying the standard normal value $z = 0.674$” …