public double GetHighestStandardDeviation()
{
var personsByCities = GetPersonsGroupedByCity();
var maxStandardDeviation = 0.0d;
foreach (var personsByCity in personsByCities)
{
var ages = ConvertPersonsToAges(personsByCity.Value);
var standardDeviation = StandardDeviation.CalculateStandardDeviation(ages);
if (standardDeviation > maxStandardDeviation)
{
maxStandardDeviation = standardDeviation;
}
}
return(maxStandardDeviation);
}
public string GetCityWithLowestStandardDeviation()
{
var personsByCities = GetPersonsGroupedByCity();
var city = "";
var minStandardDeviation = double.MaxValue;
foreach (var personsByCity in personsByCities)
{
var ages = ConvertPersonsToAges(personsByCity.Value);
var standardDeviation = StandardDeviation.CalculateStandardDeviation(ages);
if (standardDeviation < minStandardDeviation)
{
minStandardDeviation = standardDeviation;
city = personsByCity.Key;
}
}
return(city);
}