What is 15/4 •5/1•5/1 and please explain how you got the answer

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.

Which number produces a rationale number when multiplied by 1/5

For the inequality |c| < |d| to be true, which of the following must be true?