Question

Draw less than and greater than give then find median

Age	$20-25$	$25-30$	$30-35$	$35-40$	$40-45$	$45-50$	$50-55$	$55-60$	$60-65$	$65-70$
Cf	$21$	$40$	$90$	$130$	$146$	$166$	$176$	$186$	$195$	$199$

Answer 1

$Age$	$cf$	$f$
$20-25$	$21$	$21$
$25-30$	$40$	$40-21=19$
$30-35$	$90$	$90-40=50$
$35-40$	$130$	$130-90=40$
$40-45$	$146$	$146-130=16$
$45-50$	$166$	$166-146=20$
$50-55$	$176$	$176-166=10$
$55-60$	$186$	$186-176=10$
$60-65$	$195$	$195-186=9$
$65-70$	$199$	$199-195=4$

$Age$	$LCM$	$Age$	$GCM$
Less than $25$	$21$	Greater than $20$	$199$
Less than $30$	$40$	Greater than $25$	$178$
Less than $35$	$90$	Greater than $30$	$159$
Less than $40$	$130$	Greater than $35$	$109$
Less than $45$	$146$	Greater than $40$	$69$
Less than $50$	$166$	Greater than $45$	$53$
Less than $55$	$176$	Greater than $50$	$33$
Less than $60$	$186$	Greater than $55$	$23$
Less than $65$	$195$	Greater than $60$	$13$
Less than $70$	$199$	Greater than $65$	$4$

From graph we get, $Median=37.5$