mean age of 25 students of a club was 38 years if five members with mean age of 42 years have left the club , what is the present mean age of the club member
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Original members:
Mean age of 25 members = 38 years old (Given)
Total age of the 25 members = 25 x 38 = 950 years old
.
Members that left:
Mean age of 5 members that left = 42 years old (Given)
Total age of the 5 members = 42 x 5 = 210 years
.
Present members:
Total number of members at present = 25 - 5 = 20
Total age of the 20 members = 950 - 210 = 740 years old
Mean age of the 20 members = 740 ÷ 20 = 37 years old
.
Answer: The present mean age is 37 years old.
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