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 Find the median life time of a lamp.

The following data gives the distribution of total monthly household expenditure of 200 families of a village. Find the modal monthly expenditure of the families . Also, find the mean monthly expenditure. {:("Expenditure (in ₹) ","Number of families "),(1000-1500," "24),(1500-2000," "40),(2000-2500," "33),(2500-3000," "28),(3000-3500," "30),(3500-4000," "22),(4000-4500," "16),(4500-5000," "7):}