X-4 = 1
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Help me please

How to solve it and what thw answer is

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.

Tcan be concluded that % of the seniors would prefer to see more candid pictures in this year's edition of the yearbook.