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LUCKY_DIMON [66]
3 years ago
11

The slope of the minute hand on an analog clock is given by the expression cot(π/30 t), where t is time in minutes. Which of the

following best represents the first time when the slope is 0.5?
-9.7 min.
-10.0 min.
-10.3 min.
-10.6 min.
Mathematics
1 answer:
wariber [46]3 years ago
4 0

Answer:

10.6 minutes.........

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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
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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:

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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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Read 2 more answers
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