If 5 years ago the mean of weight of 4 persons was 45.If 5th person joined today the mean of their weight is 49.Find weight of 5th person
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65 kg is the weight of the person.
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Mean weight of 4 persons=45kg
Total weight=45×4=180kg ...(i)
Mean of 5 persons (the included one)= 49kg
Total weight=5×49=245 ...(ii)
5th one's weight= Total of 5 persons- Total of 4 persons,
Hence,
=>245-180
Or, 65 kg
His weight is 65 kg.
Total weight=45×4=180kg ...(i)
Mean of 5 persons (the included one)= 49kg
Total weight=5×49=245 ...(ii)
5th one's weight= Total of 5 persons- Total of 4 persons,
Hence,
=>245-180
Or, 65 kg
His weight is 65 kg.
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