Math
posted by William on .
The following data represent what 18 people said when they were asked to estimate the crowd at a public gathering:
325 450 500 500 550 575 575 600 600
650 650 700 700 700 725 750 800 900
State the mean, mode, median
Mean:
325+450+500+500+550+575+575+600+ 600+650+650+700+700+700+725+750+800+900/18 = 625
Median: Is it 600 or 700550=625? If so why? :S I don't understand it...
Mode: 700
Can someone verify if it is correct or wrong?
Thanks

The median is the number between the two in the middle. Half way between 600 and 650 = 625.
http://www.purplemath.com/modules/meanmode.htm 
Just to clarify, 18/2= 9 therefore its in position 9 and 10? then add up and divided by two again? This is only for an even number of data right?

Right.
You could have added 600 and 650 and divided by 2 to get 625.