Question 12

1.   In a school, the ratio of those who passed to those who failed in a History test is 4:1. 

  If 7 students are selected at random from the school, find correct to two decimal
places, the probability that:

  (i)    atleast 3 students passed the test;
(ii)   between 3 and 6 students failed the test.

1.   A fair die is thrown five times, find the probability of obtaining a six three times.