Probability of System Malfunction & Defective Tubes Selection

[axnman]

Que. 1 : In a mech. sys. 5 bulbs are used and system will operate if any 3 are functioning. Given that 15% of bulbs are defective , with aid of binomial PDF determine what are the chances that the system will malfunction?

Que. 2 : Suppose 15% of total population of tubes is defective and that 5 tubes are randomly selected. Determine the probability that there will be among those selected:
1) no defectives
2) only 2 defectives
3) no more than 2 defectives
4) only 3 defectives
5) no more than 3 defectives

 

[axnman]

solved thanks