How do you...
2 years ago
Making Maths Fun!!
If the total frequency is 60
draw a line from the frequency axis at 30 to the curve. Draw a vertical line to the x axis and read off. This is the mean
for LQ do as above but at 15 and 45 on the frequency axis.
it is an estimate as you have drawn a curve and everyone’s will be slightly different
I'm available for 1:1 private online tuition!Click here to view my profile and arrange a free introduction.
Typically with a cumulative frequency diagram you will be asked to find the median and the upper and low quartiles. The median is found by the total frequency which is value on the y axis of the highest part of the graph and dividing it by 2, draw a line across from that value on the y axis to the graph and then a vertical line down to the x axis to find the median value. For the lower quartile, divide the total frequency by 4. For the upper quartile, divide the total frequency by 4 and then multiply by 3.
Think you can help?