Question
PSLE
The average height of a group of children was 133.3 cm. When Mr Lau measured and recorded the height of these children, he wrongly recorded one child's height as 146 cm when it should have been 164 cm. As a result, Mr Lau calculated the average height as 130.3 cm. How many children were there in the group?
2 m

Click button first when a symbol is required. X

PSLE
The average height of a group of children was 133.3 cm. When Mr Lau measured and recorded the height of these children, he wrongly recorded one child's height as 146 cm when it should have been 164 cm. As a result, Mr Lau calculated the average height as 130.3 cm. How many children were there in the group?