1. A man has 5 grandchildren, 4 girls and 1 boy. He thinks this is unusual. If the probability that any child born

will be a girl is 1/2, what is the probability that a person who has 5 grandchildren will have exactly 4

granddaughters? Is this case unusual? Explain.

2 To be on the safe side three detectors were installed in a facton moon

Question

Charity Wu

Mathematics

3 May, 17:33

1. A man has 5 grandchildren, 4 girls and 1 boy. He thinks this is unusual. If the probability that any child born

will be a girl is 1/2, what is the probability that a person who has 5 grandchildren will have exactly 4

granddaughters? Is this case unusual? Explain.

2 To be on the safe side three detectors were installed in a facton moon

+3

Answers (1)

Know the Answer?

Kirsten Lynch · Answer 1

6.25%

Step-by-step explanation:

To know the final probability that this has happened, we must multiply the probability of each event, they tell us that the probability that it is a girl is 1/2 and this happened 4 times, therefore:

(1/2) ^ 4 = 0.0625

that is, the probability that 4 girls are born is 6.25%

an unusual probability is considered when it is less than 5%, therefore, although it approaches this figure, it is not unusual