posted by Anonymous .
the mean of the scores of student during the first 5 months is 23.8 ( what is the score of the 6 month if the mean of his scores is 24 marks?
sum of the first 5 months = 5x23.8 = 119
sum of scores for 6 months = 6x24 = 144
so the score for the 6th month is ...... ?