two years ago the mean age of 40 people was 11 years now a person left the group and mean age is changed to 12 years find the age of the person who left the group
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HEY !!!
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two years ago the mean age for 40 ppl was 11 yrs. So total age two years ago should be 11 x 40 = 440 .
Now, after two years the total age should go up 2 times 40 people = 80 + 440 = 520.
When one person left, the for 39 ppl the mean age is 12. That is 12 times 39 = 468.
Deduct 520 - 468 = 52 years is the age of the person left.
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HOEP IT'S HELP U ☺️☺️
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two years ago the mean age for 40 ppl was 11 yrs. So total age two years ago should be 11 x 40 = 440 .
Now, after two years the total age should go up 2 times 40 people = 80 + 440 = 520.
When one person left, the for 39 ppl the mean age is 12. That is 12 times 39 = 468.
Deduct 520 - 468 = 52 years is the age of the person left.
==========================================
HOEP IT'S HELP U ☺️☺️
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