1]watch ticking-5 decibels
2]whispering-10 decibels
3]air sound-20 decibels
4]soft conversation-40 decibels 
5]loud conversation- 60 decibels
6]soft music-90 decibels 
7]loud music-100 decibels
8]train sound-120 decibels
9]whale singing-160 decibels
10]nuclear bombing-200 decibels
1 5 1
mean=sum of all observations/total no.of observations
sum of all observation is 80.5 and total observation are 10 so mean =80.5
there is no mode
median is 65
there is a long formula for it but i cant explain it here. u will be confused here