Given below is the frequency distribution of wages (in Rs.) of 30 workers in a certain factory:
`{:("Wages (In Rs.)", 110-130,130-150,150-170,170-190,190-210,210-230,230-250),(" No. of workers", ""3,"4","5","6","5","4","3"):}` A worker is selected at random. Find the probability that his wages are:
(i)less than Rs. 150            (ii)  at least Rs. 210 (iii)more than or equal to 150 but less than Rs. 210

Explanation

Total number of outcome=`30`
(i)workers whose wages are less than 150=`3+4=7`
P(wages are less than 150)=`7/30`
(ii)workers whose wages are at least Rs. 210=`3+4=7`
P(wages are at least Rs. 210)=`7/30`
(iii)No. of workers having more than or equal to Rs. 150 but less than Rs. 210=`5+6+5=16`
P(wages of workers having more than or equal to Rs. 150 but less than Rs. 210)=`16/30`