Answer:
lawyer will be late for at least 17 days
Explanation:
given,
average time for a one way trip = 24 minutes
standard deviation = 3.8 minute
P(of late) = P(x>20 min)
=
= 0.5 + 0.3531
= 0.8531 = 85.31 %
days lawyer would be late for work
= n p = 20 × 0.8531 = 17.062 days
hence, lawyer will be late for at least 17 days during a period of 20 work day.