Please calculate the standard deviation of this dataset.

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

It is said that the wind becomes particularly strong on the 210th day.

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

When you use a negation, the meaning of the sentence is reversed.

His speech was a double negative, making it difficult to understand.

Mr. Namihei is my neighbor.

I can't go to college because the tuition is too high.

His life is just like a burning chariot.

My specialty is urology, and I am particularly interested in kidney research.