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8. The heights of 13 boys and 12 girls were measured. It was found that the mean height of boys was 1.69 m and that

8. The heights of 13 boys and 12 girls were measured. It was found that the mean height of boys was 1.69 m and that of the girls was 1.62 m. What was the mean height of the whole group . 9. The weights of 7 boys and 13 girls were measured. It was found that the mean Wight of the boys was 58.1 kg and that of the girls was 62.7 kg. What was the mean weight of the whole group

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