A Young Boy Is Fishing Off the End of a Dock

Essay

A young boy is fishing off the end of a dock. He estimates that for one out of every 15 times he casts his line, he gets at least a
nibble from a curious fish. He is going to cast his line 50 times before he switches to toad hunting.
-What are the mean and standard deviation of the number of successes he will have out of
the 50 attempts?