the mean of 30 students in a class is 14 years.5 students with mean age 15 years left the class.find the mean age of the remaining students
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the mean of remain. students is 13 years
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total age of 30 students =14×30=420yrs
mean of 5 students =15
total age =15×5=75 yrs
students left (age) =420-75=345
students left =30 -5=25
mean=345÷25
=13.8