Please calculate the standard deviation of this dataset.

He seems calm on the surface, but he is very upset inside.

I broke out in a cold sweat when I heard his words.

In Meiji-era Japan, the Ministry of War was in charge of military affairs.

My grandmother has become a centenarian.

He was treated as a social outcast at school.

After listening to her story, I cried in sympathy.

His chin is very distinctive.

He was sitting on the stump in the garden, reading a book.

He does calf muscle training at the gym every day.