in a school out of 30 teachers a teacher whose age is 60yr get retired. in place place of retired teacher, another teacher whose age is 30 ye appointed. then what will be the new mean age?
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Answer:
decreases by 1 year
⇒the decrease in the total age by
⇒(60-30)=30 years
⇒So average or mean age will be decrease by ⇒30/30=1 year
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