MHB Finding the Period of a Sinusoidal Model for Ice Cream Sales

mathuravasant
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The owner of an ice cream shop kept records of the average number of sales per month for 2019. Create a sinusoidal equation to model this information of number of sales per month.I found the maximum, minimum for this, but how can I find the period of from this table.
As I already know formula to find period is =2pi/k but how can I find K-value from this chart??
 

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Hint: Looks to me like the time span between January and November is the first 1/2 of a sine wave, doesn't it?

-Dan
 

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