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aev [14]
3 years ago
13

Please help me understand this!

Mathematics
1 answer:
Fiesta28 [93]3 years ago
6 0
8 divided by 3.14
12•3.14
4• square root of 3.14 divided by 3.14
16 divided by 3.14
144•3.14 squared

Hope it helped:)
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A poll agency reports that 75% of teenagers aged 12-17 own smartphones. A random sample of 234 teenagers is drawn. Round your an
GalinKa [24]

Answer:

If our random variable of interest for this case is X="the number of teenagers between 12-17 with smartphone" we can model the variable with this distribution:

X \sim Binom(n=234, p=0.75)

And the mean for this case would be:

E(X) =np = 234*0.75= 175.5

And the standard deviation would be given by:

\sigma =\sqrt{np(1-p)}= \sqrt{234*0.75*(1-0.75)}= 6.624

Step-by-step explanation:

If our random variable of interest for this case is X="the number of teenagers between 12-17 with smartphone" we can model the variable with this distribution:

X \sim Binom(n=234, p=0.75)

And the mean for this case would be:

E(X) =np = 234*0.75= 175.5

And the standard deviation would be given by:

\sigma =\sqrt{np(1-p)}= \sqrt{234*0.75*(1-0.75)}= 6.624

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Answer:

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Step-by-step explanation:

<h2>Remember to line up the decimal point when adding numbers that contain decimals.</h2>

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