Question
PSLE
The average height of a group of girls was 153.6 cm. When Mr Chan measured and recorded the height of these girls, he wrongly recorded one child's height as 137 cm when it should have been 173 cm. As a result, Mr Chan calculated the average height as 149.6 cm. How many girls were there in the group?
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PSLE
The average height of a group of girls was 153.6 cm. When Mr Chan measured and recorded the height of these girls, he wrongly recorded one child's height as 137 cm when it should have been 173 cm. As a result, Mr Chan calculated the average height as 149.6 cm. How many girls were there in the group?