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

A bulb is selected at random. Find the probability that the life time of the selected bulb is less than 400 hours."

Given:

The life time of 400 neon lamps.

A bulb is selected at random. 

To do:

We have to find the probability that the life time of the selected bulb is less than 400 hours.

Solution:

Total number of neon lamps $=400$

Number of bulbs having life time less than 400 hours $=14$

We know that,

Probability of an event=$ \frac{Number \ of \ favourable \ outcomes}{Total \ number \ of \ outcomes}$

Therefore,

Probability that the life time of the selected bulb is less than 400 hours $=\frac{14}{400}$

$=\frac{7}{200}$

The probability the life time of the selected bulb is less than 400 hours is $\frac{7}{200}$.     

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Updated on: 10-Oct-2022

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