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asambeis [7]
3 years ago
7

find the probability of at least 2girls in 6 births assume that the male and female birth are equally likely and that tha births

are independent events
Mathematics
1 answer:
Leni [432]3 years ago
4 0

Answer:

57/64

Step-by-step explanation:

exactly 6 boys:  (1/2)^6  BBBBBB

exactly 5 boys:  6*(1/2)^6  BBBBBG BBBBGB (and the 4 other slots the girl can fall)

at least 2 girls is equal to all other scenarios (where there are not 5 or 6 boys)

= 1 - [exactly 6 boys] - [exactly 5 boys]

= 1 - (1/2)^6 - 6*(1/2)^6

= 1 - 7*(1/2)^6

= 1 - 7(1/64)

= 1 - 7/64

= 57/64

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Question 18

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The difference of two numbers is 3. Their sum is - 24. Find the numbers.
Katarina [22]

Answer:

y = -13.5

x = -10.5

Step-by-step explanation:

Hi there!

Let the two numbers be equal to <em>x</em> and <em>y</em>.

The difference of two numbers is 3 ⇒ x - y = 3

Their sum is - 24 ⇒ x + y = -24

Solve using elimination:

x - y = 3

x + y = -24

Add the two equations:

x + x - y + y = 3 - 24

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Solve for y:

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