Q17 of 50 Page 15

The following table gives the life time of 400 neon lamps:

A bulb is selected at random. Find the probability that the lifetime of the selected bulb is:

(i) less than 400


(ii) between 300 to 800 hours


(iii)at least 700 hours.

Concept Used:



Explanation:


Given:


(i) The probability that the life time of the selected bulb is less than 400


(ii) The probability that the lifetime of the selected bulb is between 300 – 800 hours


(iii) The probability that the lifetime of the selected bulb is at least 700 hours


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