I need help asap!! please

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.

7+(3n++8) what is the answer to this?

What is the mean of the data set 125, 141, 213, 155, 281