How would I answer this?

A wildlife biologist examines frogs for a genetic trait that may be linked to toxins in the environment. Previous research had estimated that this trait is usually found in 1 of every 8 frogs. The biologist decides to collect and examine 150 frogs. a) Determine the mean and standard deviation of the number of frogs with the trait the biologist should expect to find in the sample. (Round to two decimal places as needed.)