Posted by **Rajan** on Thursday, March 28, 2013 at 1:09pm.

The bulbs manufactured by a company gave a mean life of 3000 hours with standard

deviation of 400 hours. If a bulb is selected at random, what is the probability it will

have a mean life less than 2000 hours?

Question:

1) Calculate the probability.

2) In what situation does one need probability theory?

- Contitative Methodes -
**Sardar Hakim**, Monday, September 16, 2013 at 7:23am
CASE STUDY: 1

The bulbs manufactured by a company gave a mean life of 3000 hours with standard

deviation of 400 hours. If a bulb is selected at random, what is the probability it will

have a mean life less than 2000 hours?

Question:

1) Calculate the probability.

2) In what situation does one need probability theory?

3) Define the concept of sample space, sample points and events in context of

probability theory.

4) What is the difference between objective and subjective probability?

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