18 The table gives information about the times, in hours, some students spent doing sport one week.
Time (T hours)
Frequency
0 5
2 <134
9
4 24
6 40
8 7
Calculate an estimate for the mean time these students spent doing sport.
Give your answer in hours, correct to 1 decimal place.
help pls

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.

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