Question

the average age of 24 students and the class teacher is 16 years .if the class teacher age is excluded the average age is reduced by 1 year .what is the age of class teacher​

Answer 1

USING MEAN FORMULA

MEAN =

GIVEN DATA /TOTAL NO: OF OBSERVATION

x1 +.......x24 / 24 = 16

x1 + x2 .... . x24 = 384-----(1)

x1 +x2........x23 / 23 = 15

x1 + x2.......x23 = 345--------(2)

subract eq 1 and 2

x24 = 384 - 345 = 39

age of teacher is 39

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