The mean salary paid at the firm isx'

_{13}= (N_{1}x'_{1}+N_{2}x'_{2}+N_{3}x'_{3})/(N_{1}+N_{2}+N_{3})where, N_{1 }= 5, N_{2}= 2, N_{3}= 1 x'_{1}= 25000, x'_{2}= 60000, x'_{3}= 255000=> x'_{13}= {(5*25000) + (2*60000) + (1*255000)}/(5+2+1) = (260000+120000+255000)/8 = Rs. 62,500Therefore, the mean salary paid at the firm is Rs. 62,500. No. Of employees who earn less than the mean is 7.The salaries of employees are 25000,25000,25000,25000,25000,60000,60000,255000.Thus, the median will be = (25000+25000)/2 = 25000