1. In a five-match test series, the runs scored by the two opening batsmen were as given in Table 10.3. Calculate the mean score over the series for each batsman.

2. The grouped data of Table 10.4 represents the percentage marks scored by 66 candidates in an examination. Calculate the mean percentage mark.

3. The heights of a sample of 20 plants were measured to the nearest millimetre. The results were as given in Table 10.5.

Calculate the mean height.

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Player A 50 140 0 38 130 60 21 55 0 138 Player B 70 30 56 68 61 58 48 86 52 72 Table 10.3 Scores for two opening batsmen