A-Level Edexcel Biology AS Arithmetic Means

A-Level Edexcel Biology AS Arithmetic Means
Pearson Edexcel International Advanced Subsidiary/Advanced Level in Biology, Issue 2, February 2021Biology XBI11/YBI11

Review A-Level Edexcel Biology arithmetic means through short calculations from biological datasets, including amino acid mass and cardiac-cycle timing.

How this is tested

  • calculate arithmetic means from biological measurements and round to suitable precision

Question 4(b)(ii)

[Maximum number: 1]

The effect of atropine and propranolol on heart rate was investigated.

One group of people, group 1, were given propranolol each day for four days followed by atropine for four days.

A second group of people, group 2, were given atropine each day for four days followed by propranolol for four days.

The graph shows the results of this investigation.

Mean heart rate/ beats min−1\mathrm{min}^{-1}

Figure for Question 4(b)(ii) — Edexcel A-Level Biology AS

Calculate the mean length of the cardiac cycle for group 2 on day 4.

Answer seconds