The score in Maths of 50 students of a class is given in the following table. Calculate the mean score. Interval Frequencies 0-10 2 10-20 11 20-30 28 30-40 6 40-50 3

28.8 22.2 24.4 26.6

24.4

Mean score = \(\frac{5× 2 + 15 ×  11 + 25× 28  + 35× 6+45× 3 }{50}\)  = \(\frac{10 + 165 + 700  + 210 +135 }{50}\)  = \(\frac{1220 }{50}\)  = 24.4