Question

John, received the given graph as the record of his heart rate. If the average heart rate of a healthy person is 72 beats per minute. Calculate John's health using the given formula.
(The formula can only be used for average heart rates less than 72.)

$Health=\frac{\text{Average heart rate}}{72}\times 100$

• A. 65%
• B. 54%
• C. 90%
• D. 75%

Answer 1

The correct option is D 75%

Entering the values on the graph into a table, we get:

Trial	1	2	3	4
Heart rate (bpm)	52	54	55	55

$Average=\frac{52+54+55+55}{4}=\frac{216}{4}=54bpm$

Now, calculating John's health as per the given formula, we get:

$Health=\frac{\text{Average heart rate}}{72}\times 100=\frac{54}{72}\times 100=\frac{3}{4}\times 100=75\%$