The following table gives the distribution of the life - time of 400 neon lamps.
`{:("Lif time (in hours)","Number of lamps"),(1500-2000,14),(2000-2500,56),(2500-3000,60),(3000-3500,86),(3500-4000,74),(4000-4500,62),(4500-5000,48):}`
Find the median life -time of a lamp .

The following table gives the distribution of the lifetime of 400 neon lamps : {:("Lifetime (in hours) ","Number of lamps "),(" "1500-2000," "14),(" "2000-2500," "56),(" "2500-3000," "60),(" "3000-3500," "86),(" "3500-4000," "74),(" "4000-4500," "62),(" "4500-5000," "48):} Find the median of a lamp.

The following table gives the distribution of the life time of 400 neon lamps: Lite time: (in hours) Number of lamps 1500-2000 14 2000-2500 56 2500-3000 60 3000-3500 86 3500-4000 74 4000-4500 62 4500-5000 48 Find the median life.

The following table gives the distribution of the life time of 400 neon lamps: Lite time: (in hours) Number of lamps 1500-2000 14 2000-2500 56 2500-3000 60 3000-3500 86 3500-4000 74 4000-4500 62 4500-5000 48 Find the median life.

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

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 distribution of the life-time of 400 neon lamps Find the median life time of a lamp.

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 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: How many lamps have a life time of more than 700 hours?