Unprotected sex with a partner who is infected with HSV-2 (genital herpes) and who is currently experiencing an outbreak, leads to transmission of the infection 70% of the time.

a)If 15 people have sexual contact with an infected partner during an outbreak, what is the mean number of people that would be expected to contract HSV-2?

b)What is the standard deviation?

c)Would it be unusual if 13 of the 15 partners contracted HSV-2?

d) Why?