Question
PSLE
The average height of a group of students was 135.6 cm. When Mr Yang measured and recorded the height of these students, he wrongly recorded one child's height as 186 cm when it should have been 168 cm. As a result, Mr Yang calculated the average height as 138.6 cm. How many students were there in the group?
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PSLE
The average height of a group of students was 135.6 cm. When Mr Yang measured and recorded the height of these students, he wrongly recorded one child's height as 186 cm when it should have been 168 cm. As a result, Mr Yang calculated the average height as 138.6 cm. How many students were there in the group?