You need to know the probability of the event in question. Then the expected frequency for that event occurring is that probability times the number of times the experiment was repeated.
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Frequency=1/time
For goodness of fit test using Chisquare test, Expected frequency = Total number of observations * theoretical probability specified or Expected frequency = Total number of observations / Number of categories if theoretical frequencies are not given. For contingency tables (test for independence) Expected frequency = (Row total * Column total) / Grand total for each cell
frequency = (wave speed)/(wavelength) frequency = 1/(period)
The formula to determine speed is Speed= wavelength*frequency
Probability of event = relative frequency = f/nf is the frequency of the event occurence in a sample of n observances.