I need it today please help me

Suppose a man is heterozygous for heterochromia, an autosomal dominant disorder which causes two different‑colored eyes in an individual, produced 25‑offspring with his normal‑eyed wife. of their children, 15 were heterochromatic and 10 were‑normal. calculate the chi‑square value for this observation.

On average, how many more hits will he get when he bats 100 times at home during the day as opposed to 100 times away at night?

How to do this , and can some one explain