a)Mr Smith is a local tax agent with 20 years of experience. He knows that the time taken to complete a single tax retur

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a)Mr Smith is a local tax agent with 20 years of experience. He
knows that the time taken to complete a single tax return is
normally distributed with a mean of 30 minutes and a standard
deviation of 12 minutes.
i)Find the probability that a selected tax return will take more
than 50 minutes to complete
ii)Mr. Smith has just been approached by a small company for him
to complete the tax returns of all of their 20 employees within the
next working day. Assuming that Mr. Smith works 8 hours a day, what
is the probability that the total time it takes
Mr. Smith to complete all the tax returns for the 20 employees is
less than 8 hours?