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Yuki888 [10]
3 years ago
15

I need help and if I can I will give brainilest

Mathematics
1 answer:
Sergio039 [100]3 years ago
3 0

Answer:

8000

Step-by-step explanation:

Total number of homes in given data is 7+33+56+42+12 = 150

Now out of 150 there is 12 homes who have 4 or more phones

Let's set up proportions

150 / 12 = 100,000 / X

x=100000×12 /150

X=8000

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The answer is 5.5

The standard deviation (sd or σ) of the sample mean difference is:
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For the population A:
sd₁ = 17.6
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For the population B:
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Hence:
sd = √(sd₁²/n₁ + sd₂²/n₂)
    = √(17.6²/20 + 21.2²/30)
    = √(309.76/20 + 449.44/30)
    = √(15.49 + 14.98)
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4 years ago
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