A student measures the oscillations of a water wave in three trials:
Trial 1: 25 oscillations in 2.5 s
Trial 2: 40 oscillations in 3.8 s
Trial 3: 35 oscillations in 3.3 s
If the wavelength of the wave is 0.30 m, what is the approximate speed of the wave based on the average frequency of the trials?
a) 3.9m/s
b) 30m/s
c) 3.1m/s
d) 3.0m/s