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**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