In 2009 the average fee paid by hampr nbspblock tax


In 2009, the average fee paid by H&R  Block tax preparation customers was $187. Assume that the standard deviation of fees was $60 but that we have no idea regarding the shape of the population distribution.

Source: hrblock.com, July 14,  2009.

a. What additional assumption about the population would be needed in order to use the standard normal table in determining the probability that the mean fee for a simple random sample of 5 customers was less than $170?

b. What is the probability that the mean fee for a simple random sample of 36 customers was less than $170? What role does the central limit theorem play in making it possible to determine this probability?

Request for Solution File

Ask an Expert for Answer!!
Basic Statistics: In 2009 the average fee paid by hampr nbspblock tax
Reference No:- TGS01282011

Expected delivery within 24 Hours