Thread: Probability

A new factory machine which manufactures computer chips is malfunctioning and has a 20% defect rate. If 5 chips are randomly selected from the machine, find the following probibilities: non are defective; less than 2 are defective.

Originally Posted by batman123

A new factory machine which manufactures computer chips is malfunctioning and has a 20% defect rate. If 5 chips are randomly selected from the machine, find the following probibilities: non are defective; less than 2 are defective.

The probability that is would be correct is , just let us use fractions which is . Now each 5 should be correct thus,
.

For the second part you need to use the formula:
to determine the probability of something exactly happening out of a certain amount of times.

Over here you need it to be zero times exactly OR one time exactly of getting a defect. Zero times is the same as all 5 where non-defective which is the same as in the first problem is 33%. To determine of getting exactly one defect use . Thus, the overall probability is the sum which is approximately 73%.

This is my 5th post!!

Thanks!!! for all your help

Welcomed.