Question

известно что в некотором регионе вероятность того что родившийся младенец окажется мальчиком 0,485 в 2008 году в этом регионе на 1000 родившихся младенцев в среднем приходилось 477 девочек. на сколько частота рождения девочки в 2008 г в этом регионе отличается от вероятности этого события?

Answer 1

Вероятность того что родится девочка 1-0,485=0,515
Частота рождения девочек 477/1000=0,477
Вероятность - частота = 0,515-0,477=0,038
Частота на 0,038 меньше вероятности

Answer 2

Probability of a Baby Being a Boy in a Certain Region

In a certain region, the probability of a newborn baby being a boy is 0.485. In 2008, in this region, there were on average 477 girls born per 1000 newborns. The question is: by how much does the birth frequency of girls in 2008 in this region differ from the probability of this event?

To calculate the difference, we can subtract the probability of a baby being a boy from the frequency of girls being born in 2008 in this region.

Calculation: - Probability of a baby being a boy: 0.485 - Frequency of girls being born in 2008: 477 per 1000 newborns

The difference can be calculated as: \[ \text{Difference} = \text{Frequency of girls being born} - \text{Probability of a baby being a boy} \]

Difference: \[ \text{Difference} = 477/1000 - 0.485 \]

\[ \text{Difference} = 0.477 - 0.485 \]

\[ \text{Difference} = -0.008 \]

The difference between the frequency of girls being born in 2008 in this region and the probability of a baby being a boy is -0.008. This means that the frequency of girls being born in 2008 in this region is 0.8% lower than the probability of a baby being a boy.