8out of 10 boys play a sport; 25 out of 30 boys play a sport.
determine if each pair of ratio or rates are equivalent. explain your reasoning.

Successful implementation of a new system is based on three independent modules. module 1 works properly with probability 0.96. for modules 2 and 3, these probabilities equal 0.95 and 0.90. compute the probability that at least one of these three modules fails to work properly.