Question

The mean weight of nine girls in a group is 45 kg, the individual weight of eight of them are 51 kg, 45 kg, 45 kg, 46 kg, 50 kg, 52 kg,55 kg and 44 kg. the weight of the ninth girl is​

Answer 1

Answer:

let the ninth term be X so

Step-by-step explanation:

51+45+45+46+50+52+55+44+x/9=45

so answer is 17

Answer 2

Step-by-step explanation:

Arrange the data in ascending order

44, 45, 45, 46, 50, 51, 52, 55 (all in Kgs)

Let, the weight of 9th girl= X kg

Mean weight of 9 girls = 45 Kg

Total weight of 9 girls = 45×9 Kg= 405 Kg

44+45+45+46+50+51+52+55+X= 405 Kg

388+X = 405 Kg

X = 405-388 Kg

X = 17 Kg

Hence, The weight of 9th girl = 17 Kg.

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