A cat has a lot of hair. On average, it loses about 1 hair p…

A cat has a lot of hair. On average, it loses about 1 hair per minute. As you can imagine, it is not very likely for a cat to spend 1 hour in a room without losing a single hair. However, what is the standard deviation σ\sigma of the number of hairs that you expect a cat to loose in 25 min?