ExemplarExercise Problem XIV — task. Mathematics CBSE, Class 10.

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Find the mean age of

$100$ residents of a town from the following data:

Age	Number of persons
$\text{equal and above } 0$	$100$
$\text{equal and above }10$	$90$
$\text{equal and above } 20$	$75$
$\text{equal and above } 30$	$50$
$\text{equal and above } 40$	$25$
$\text{equal and above } 50$	$15$
$\text{equal and above } 60$	$5$
$\text{equal and above } 70$	$0$

Answer:

The mean is .

[Note: Enter the answer in to two decimal number.]

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