the mean height of 20 students of a class is 150 cm. when a boy leaves the class the mean height becomes down by 0.05cm . find the length of the boy
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Step-by-step explanation:
mean = (sum of the height of the total students)/(total numbers of the students)
(sum of the height of the 20 students)/20 = 150cm
sum of the height of the 20 students = 150×20cm
= 3000cm
when a boy left
(sum of the height of the 19 students)/19 = 150-0.05
= 149.95cm
sum of the height of the 19 students = 149.95×19cm
= 2849.05cm
Height of the boy = 3000 - 2849.05
= 150.95cm Answer
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