The average height of a class of 18 students is 105 cm. After the arrival of 7 new students the average
decreases by 5cm. Find sum of the heights of all the students in the class.
Select one
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The average height of a class of 18 students is 105 cm. After the arrival of 7 new students the average
decreases by 5cm. Find sum of the heights of all the students in the class.
Select one
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Answer: Total number of students = 18 + 7 = 25
Average height of the 25 students = 105 - 5 = 100 cm
Sum of height of all students = 100 x 25 = 2500cm
Total number of students = 18 + 7 = 25
Average height of the 25 students = 105 - 5 = 100 cm
Sum of height of all students = 100 x 25 = 2500cm