Biology AS

How do you calculate heart rate from a table?
Biology AQA January 2012 question 5(b)

I have a table like this:
Time/s Volume of blood/cm^3
0.0 125
0.1 148
0.2 103
0.3 70
0.4 56
0.5 55
0.6 98
0.7 125

Hey, so its heart rate times stroke volume to get the cardiac output
u found the heart rate to be 86 and the stroke volume is just max-min
so 125-55 gives 70 times 86 which is 6020

hope this helped and i have a question
is there any point in doing papers below 2009 when the speciification changes for unit 1 and unit 2?
do u think there would be any point or to just skip them ?
thaanks

one cycle took 0.7s so in 1 min u get 60/0.7 which gives u 86
And thanks the older papers are on the AQA website under older past papers and yeah I guess if you have time it's extra practice
Thanks! Good luck