Calculate the mean from the following table. Scores Frequencies 0-10 2 10-20 4 20-30 12 30-40 21 40-50 6 50-60 3 60-70 2

33.4 32.6 35.8 34.2

33.4

Total frequency = 2 + 4 + 12 + 21 + 6 + 3+ 2 = 50 Mean = \(\frac{5×2 + 15×4 + 25×12 + 35×21 + 45×6 + 55×3 + 65×2 }{50}\) = \(\frac{10 + 60 + 300 + 735 + 270 + 165 + 130 }{50}\) = \(\frac{ 1670}{50}\) = 33.4