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3 years ago

I need help ! Please

Mathematics

2 answers:

Alinara [238K]3 years ago

5 0

Answer:

30 minutes

Step-by-step explanation:

We use the red line to determine the values

X = 360

Go up to the red line and go to the left

y = 30

timurjin [86]3 years ago

5 0

Answer:

C (30 minutes)

Step-by-step explanation:

Since they spend 360 minutes on the computer, we can look at where 360 minutes on the computer is on the graph. The line shows that if a teenager spends 360 minutes on the computer they spend 30 minutes watching television.

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Thus, the mean of distribution is 2.5

Standard deviation of probability distribution:

$E(x^2) = 0^2(0.033)+ 1^2(0.149)+2^2(0.318)+3^2(0.318) +4^2(0.149) + 5^2(0.033)\\E(x^2) = 7.492\\\sigma^2 = E(x^2) - (E(x))^2\\\sigma^2 = 7.492 - (2.5)^2 = 1.242\\\sigma= \sqrt{1.242} = 1.11$