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zimovet [89]
3 years ago
14

Assume that the probability of any newborn baby being a boyboy is one half 1 2 and that all births are independent. if a family

has threethree children​ (no twins), what is the probability of the event that none of themnone of them areare boysboys​?
Mathematics
1 answer:
Arte-miy333 [17]3 years ago
4 0
I think the correct answer should be 1/8 or 1:8
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In a survey, of the voters support a particular referendum. If 40 voters are chosen at random, find the mean and variance for th
Katyanochek1 [597]

This question is incomplete, the complete question is;

In a survey, 55% of the voters support a particular referendum. If 40 voters are chosen at random,

find the mean and variance for the number of voters who support the referendum.

Answer:

a) The Mean is 22

b) Variance is 9.9

Step-by-step explanation:

Given that;

55% of the voters support a particular referendum p = 0.55

q = 1 - p = 1 - 0.55 = 0.45

sample size n = 40

a)

Mean = sample size n × p

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Therefore the Mean is 22

b)

Variance = n × p × q

so we substitute

Variance = 40 × 0.55 × 0.45

Variance = 9.9

Therefore the Variance is 9.9

3 0
3 years ago
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