The average height of 16 pupils is 125cm,when 4 pupils were added the average height was 125cm what is the average height of the 4 new pupils
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Answer:
20 cm
Step-by-step explanation:
Sum of height / 16 = 125 cm
Sum of height = 16 * 125 = 2000 cm
After adding 4 pupils,
Average height = Sum of height + sum of heights of new students/ 20 = 125 cm
2000 cm + Sum of heights of new students = 2500 cm
Sum of heights of new students = 500 cm
Average of heights of new pupils = Sum of heights of new pupils/ 4= 500 cm/4 =20cm
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