Answer :
Final answer:
To find the weight of the fifth friend, multiply the mean weight by the total number of friends, subtract the total weight of the first four friends from this product. The result is 106kg.
Explanation:
The mean weight of five friends is the total of their weights divided by five. Given that the mean weight is 86 kg, the total weight of all five friends is 86 kg * 5 = 430 kg. The weights of the first four friends are 85, 70, 75 and 94 which sums up to 324 kg. Therefore, the weight of the fifth friend is obtained by subtracting the total weight of the first four friends from the total weight of all five. That is, 430 kg - 324 kg = 106 kg. So, the weight of the fifth friend is 106 kg.
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