Jessica Asked: How do you do this? I need help.?

a "psychic" runs the following ad in a magazine: expecting a baby? renowned psychic will tell you the sex of the unborn child from any photograph of the mother. cost $10. money back guarentee.

Suppose that the psychic simply replies "boy" to all inquiries. In the worst case, everyone who has a girl will ask for her money back. Find the expected value of the psychic's profit

probability for a boy .51

girl: .49

what is the psychics profit?

the expected value?

Jessica Asked: How would you find the expected value?

OKay.
I reaaaallly need some help!
how would i calculate the expected value for this situation?

its 10 dollars to see the physic and figure out if youre having a boy or a girl.

the chance of having a boy is .52 and the chance for having a girl is .48

the psychic wants to know how much profit he'll make.
how do i do this?

Jessica Asked: Any websites or books i can read to learn how to use my psychic abilities better?

I have a gift that i can see and communicate with the dead. i am able to give a person my energy and take it, i am able to see auras, i am able to move a few things with my eyes, and i dream things that come true after. i found out about my gift when i was 8. I only use it when i have to but i want to be able to control them better and be able to not use as much energy as i already do. the problem is that when i do something (like pass my energy or concentrate on moving something without a physical touch), i use too much to the point that i make the person pass out and i get a HUGE headache and i feel very weak. I have been working on trying to get into a person's mind and i succeed but i am only able to read just a bit and then i can't get anything else. i want to learn a few things to be able to help my siblings who also have the gift that i do so that they wouldn't have to exhaust themselves as much as i do and so that they can understand what they have and only to use it for the good of people. Any books or websites or advice on what i can do? in advance: thank you 🙂