The following table shows hypothetical fluctuations in the unemployment rate of a country from January to December. Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Unemployment rate (in %) 5.6 5.8 6.3 3.9 5.4 3.7 4.5 4.9 6.3 5.5 3.9 4.0   (a) The mean unemployment rate for the year (12-month average) is ______ . Report the answer to two decimal places.   (b) Calculate the standard deviation for this data set. The standard deviation is  ______  . Report the answer to three decimal places

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