During a medical checkup, the number of heartbeats per minute of 40 pa

During a medical checkup, the number of heartbeats per minute of 40 patients were recorded and summarised as follows: Number of heartbeats per minute 64 − 68 68 − 72 72 − 76 76 − 80 80 − 84 84 – 88 Number of patients 6 8 10 12 3 1 Find the mean heartbeats per minute for these patients.

Answer» During a medical checkup, the number of heartbeats per minute of 40 patients were recorded and summarised as follows:

Number of heartbeats per minute	64 − 68	68 − 72	72 − 76	76 − 80	80 − 84	84 – 88
Number of patients	6	8	10	12	3	1

Find the mean heartbeats per minute for these patients.