A die is rolled and value is recorded. The table shows the results of 20 rolls. 6 6 3 3 3 4 2 4 2 6 3 2 1 1 1 4 6 2 6 6 (a) Complete the probability distribution table. X P ( X ) 1 0.15 2 0.15 3 0.2 4 0.15 5 0 6 0.25 (b) P ( X = 5 or X = 6 ) = 0.25 (c) Which probabilities should be added to calculate P ( X < 4 ) ? P ( 1 ) P ( 2 ) P ( 3 ) P ( 4 ) P ( 5 ) P ( 6 )