Determine whether the statement, I analyzed simple harmonic motion in which the period was 10...

Step 1 
Given statement is 
I studied simple harmonic motion with a period of 10 seconds and an oscillation frequency of 0.2 Hz.
Step 2 
10 seconds are given here as the time period.
We know that 
${\displaystyle \text{frequency}=\frac{1}{\text{Time period}}=\frac{1}{10}=0.1}$ 
So, the frequency should be 0.1 oscillation per second for 10 seconds 
It is given that the frequency is 0.2 oscillation per second for 10 seconds 
Which implies, The analysis does not make sense.