The times for a particular journey during rush hour in a large city have to mean 24.4 minutes and standard deviation 9.9 minutes. Using the Central limit theorem: Find the probability that the mean...

The times for a particular journey during rush hour in a large city have to mean 24.4 minutes and standard deviation 9.9 minutes. Using the Central limit theorem: Find the probability that the mean time taken for a random sample of 50 of the time for this journey is under 22 minutes.