Out of 30 teachers of a school, a teacher of age 60 yr. retired. In hi – McqOptions

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1.	Out of 30 teachers of a school, a teacher of age 60 yr. retired. In his place another teacher of age 30 yr. was appointed. As a result, the mean age of the teachers will :
A.	decrease by 6 months
B.	decrease by 1 yr.
C.	remain same
D.	decrease by 2 yr.
Answer» C. remain same

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