Need answer for 18 question
Dear Student,
Mean salary of 1000 workers = Rs 180.40
∴Total salary paid to 1000 workers = Rs 180.40 × 1000 = Rs 180400
The wages of two workers were wrongly taken as Rs 297 and Rs 165 instead of Rs 197 and Rs 185.
∴Correct salary paid to 1000 workers = Rs (180400 - 297 - 165 + 197 + 185)
= Rs 180320
∴Correct mean salary = 
Hope this information has solved your queries
Regards