IB Mathematics Normal Distribution

A tutorial sheet of practice questions on the normal distribution is given below.

  1. In a nation wide exam µ=65 and σ=15. Find (a) the percentage of marks greater than 70. (36.9) (b) the percentage of marks between 40 and 70. (58.3) (c) the probability that at least one of three randomly selected students scored more than 70. (d) the probability that two of three randomly selected students scored more than a certain score is 1/5. Find the score.
  2. More to come