The following table gives the life times of 400 neon lamps :
: How many lamps have a life time of more than 700 hours ?

The following table gives the distribution of the life time of 400 neon lamps : Find the median life time of a lamp.

The following table gives the life times of 400 neon lamps : : Represent the given information with the help of a histogram.

The following table gives life time of 400 neon lamps: A bulb is selected at random. Find the probability of that the life time of the selected bulb is atleast 800 hours.

The following table gives life time of 400 neon lamps: A bulb is selected at random. Find the probability of that the life time of the selected bulb is less than 500 hours.

The following table gives life time of 400 neon lamps: A bulb is selected at random. Find the probability of that the life time of the selected bulb is between 400 to 900 hours.

Name the plant having life span of more than thousand years.

Average life time is more/less than half life time for a first order reaction.