The average weight of a group of 53 girls was calculated as 58 kg. It was later discovered that the weight of one of the girls was read as 65 kg, whereas her actual weight was 45 kg. What is the actual average weight of the group of the 53 girls? (rounded off to two digits after decimal)

58.62

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58.37

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57.37

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57.62

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Solution

The correct option is D 57.62
The actual average weight of the group of 53 girls
$\frac{58 \times 53 - 20}{53} = 57.62$

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The average weight of a group of 53 girls was calculated as 58 kg. It was later discovered that the weight of one of the girls was read as 65 kg, whereas her actual weight was 45 kg. What is the actual average weight of the group of the 53 girls? (rounded off to two digits after decimal)

The correct option is D 57.62The actual average weight of the group of 53 girls58×53−2053=57.62

The correct option is D 57.62
The actual average weight of the group of 53 girls
$\frac{58 \times 53 - 20}{53} = 57.62$