A project company hired 10000 casual employees to undertake a major housing project for 2 weeks. On average (daily) these workers take 10 hours to complete a given task with a s.d deviation of 2.5...

A project company hired 10000 casual employees to undertake a major housing project for 2 weeks. On average (daily) these workers take 10 hours to complete a given task with a s.d deviation of 2.5 hours. If completion time is normally distributed, determine the no. of workers who completed the task in:

1. If the firm decides to lay off all the workers who cannot complete the task within 16.5 hours, how many workers will the firm lay-off?