In a group of 40 boys, the average height was initially determined to be 160 cm. However, it was later discovered that the height of one boy was incorrectly recorded as 165 cm when it should have been 156 cm. Calculate the accurate average height.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 159.775 cm.
Initial total height = 40 × 160 = 6400 cm
165 – 156 = 9 cm
Correct total = 6400 – 9 = 6391 cm
Correct average = 6391/40 = 159.775 cm