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Margarita [4]
3 years ago
13

Please help this doesnt really make sense. If you want to see the paper just press that pic right up there

Mathematics
1 answer:
Alex Ar [27]3 years ago
4 0
Numerator , denominator, mixed fractions, proper fractions
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4. In a sample of 1000 people, 130 can wiggle their ears. Two unrelated people are
Elina [12.6K]

Using the hypergeometric distribution, it is found that there is a 0.7568 = 75.68% probability that neither can wiggle his or her ears.

The people are chosen from the sample without replacement, which is why the <u>hypergeometric distribution</u> is used to solve this question.

Hypergeometric distribution:

P(X = x) = h(x,N,n,k) = \frac{C_{k,x}C_{N-k,n-x}}{C_{N,n}}

C_{n,x} = \frac{n!}{x!(n-x)!}

The parameters are:

  • x is the number of successes.
  • N is the size of the population.
  • n is the size of the sample.
  • k is the total number of desired outcomes.

In this problem:

  • 1000 people means that N = 1000
  • 130 can wiggle their ears, thus k = 130
  • Two are selected, thus n = 2.

The probability that neither can wiggle his or her ears is P(X = 0), thus:

P(X = x) = h(x,N,n,k) = \frac{C_{k,x}C_{N-k,n-x}}{C_{N,n}}

P(X = x) = h(0,1000,2,130) = \frac{C_{130,0}C_{870,2}}{C_{1000,2}} = 0.7568

0.7568 = 75.68% probability that neither can wiggle his or her ears.

A similar problem is given at brainly.com/question/24826394

5 0
2 years ago
Gina Chuez has considered starting her own custom greeting card business. With an initial start up cost of $1500, she figures it
Digiron [165]

1.70 - 0.45 = 1.25

1500 ÷ 1.25 = 1200

Gina must sell 1200 cards before she can make a profit

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3 years ago
[55 POINTS] Did I match these like terms correctly?
Sergeeva-Olga [200]
Yea you did jsixidjdjiejs
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3 years ago
The research of Eich and Metcalf would suggest that if you were really happy when you were learning math, you should be ________
omeli [17]
Your answer is "happy" based on <span>mood-dependent memory research they conducted.</span>
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3 years ago
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what is the area of a circle with radius of 7cm using 3.14 for pi and round to he nearest tenth plz hurry
Sophie [7]

Answer:153.9 cm

Step-by-step explanation:

The area of a circle is found by pi × radius squared and pi is aprox 3.14 so 3.15×7² = 153.86 then round off to the nearest tenth you get 153.9

5 0
3 years ago
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