3 years ago

What is the value of X?

Mathematics

1 answer:

sleet_krkn [62]3 years ago

5 0

Answer:

11/3 = 3 2/3 ≈ 3.66667

Step-by-step explanation:

The external angle is half the difference of the intercepted arcs:

3x = (1/2)((9x +25) -36)

6x = 9x -11

11 = 3x . . . . . . . add 11-6x

11/3 = x

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The attached figure is drawn to scale.

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Answer:

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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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3 years ago

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liubo4ka [24]

Answer:

the last one

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