The material point made 300 vibrations in 1 minute. determine the oscillation period and frequency.

A wobble period is the time during which one complete wobble occurs. We have 300 oscillations in 1 minute (60 seconds). From this we can conclude that time is wasted on one oscillation
T = 60/300 = 0.2 sec. This is the desired oscillation period.
The oscillation frequency is the number of complete oscillations per unit of time, that is, in 1 second. We have 300 vibrations in 60 seconds, which means 5 vibrations will occur in 1 second.
Oscillation frequency is 300/60 = 5Hz