Sex Social class Average number Total BOTH SEXES Total Average 7.80 BOTH SEXES Total Standard deviation 1.69 BOTH SEXES I Average 7.77 BOTH SEXES I Standard deviation 1.66 BOTH SEXES II Average 7.81 BOTH SEXES II Standard deviation 1.67 BOTH SEXES III Average 7.75 BOTH SEXES III Standard deviation 1.63 BOTH SEXES IV Average 7.77 BOTH SEXES IV Standard deviation 1.70 BOTH SEXES V Average 7.80 BOTH SEXES V Standard deviation 1.70 BOTH SEXES VI Average 7.79 BOTH SEXES VI Standard deviation 1.72 BOTH SEXES No data recorded Average 8.23 BOTH SEXES No data recorded Standard deviation 1.93 MALES Total Average 7.86 MALES Total Standard deviation 1.65 MALES I Average 7.65 MALES I Standard deviation 1.55 MALES II Average 7.78 MALES II Standard deviation 1.60 MALES III Average 7.83 MALES III Standard deviation 1.62 MALES IV Average 7.80 MALES IV Standard deviation 1.63 MALES V Average 7.87 MALES V Standard deviation 1.68 MALES VI Average 7.95 MALES VI Standard deviation 1.62 MALES No data recorded Average 8.84 MALES No data recorded Standard deviation 1.93 FEMALES Total Average 7.74 FEMALES Total Standard deviation 1.73 FEMALES I Average 7.89 FEMALES I Standard deviation 1.76 FEMALES II Average 7.83 FEMALES II Standard deviation 1.73 FEMALES III Average 7.68 FEMALES III Standard deviation 1.63 FEMALES IV Average 7.73 FEMALES IV Standard deviation 1.78 FEMALES V Average 7.72 FEMALES V Standard deviation 1.71 FEMALES VI Average 7.66 FEMALES VI Standard deviation 1.79 FEMALES No data recorded Average 7.87 FEMALES No data recorded Standard deviation 1.83