A work sampling method is used to determine the proportion of the time a machine is idle. The following information was gathered on a random basis.

$\backslash$table$[[$Day$,\backslash$table$[[$No$.$ Times$],[$Machine Idle$]],\backslash$table$[[$Total No$.$ of$],[$Observations$]]],[$Monday$,4,12],[$Tuesday$,2,8],[$Wednesday$,4,10],[$Thursday$,2,10]]$

What is the proportion of idle time observed for this machine?

greater than $15\%$ but less than or equal to $25\%$

greater than $25\%$

less than or equal to $5\%$

greater than $5\%$ but less than or equal to $15\%$