The average height of a group of 40 students was calculated as 155 cm. It was later discovered that
the height of one student was read as 157 instead of 137 cm. Calculate the correct average height
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Answer:
151cm
Explanation:
Average height of 40 students = 150 cm (Incorrect mean)
Total sum of height of 40 students = (150×40) cm = 6000 cm
Wrong observation = 125 cm
Correct observation = 165 cm
Correct sum total of heights of 40 students = ( 6000 - 125 +165) cm = 6040 cm
Correct mean = 6040/40 cm = 151 cm
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