a) Given,
Heart beats 75 times a minute
Converting minute into seconds, we get,
1 min = 60 s
As, frequency (f) is the number of times the heart beats in a second
Therefore, we get,
f = 75\over 60 = 1.25 Hz
Hence, Frequency = 1.25 Hz
(b) Time Period (t) = 1\over f
Substituting the values, we get,
t = 1\over 1.25 = 0.8
Hence, t = 0.8 s