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2 years ago

12

Look at the time on the following clocks. How much time has passed from the first clock to the second clock? The time passed is

less then 12 hours.

1 answer:

Lina20 [59]2 years ago

4 0

5 hours and 4 minutes

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Answer:

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Step-by-step explanation:

We are given the following distribution:

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Formula:

$E(x) = \displaystyle\sum x_iP(x_i)\\\\E(x) =0(0.3) + 1(0.5) + 2(0.2) + 3(0.4)\\\\E(x) = 2.1\\\\E(x^2) = \displaystyle\sum x_i^2P(x_i)\\\\E(x^2) =0(0.3) + 1(0.5) + 4(0.2) + 9(0.4)\\\\E(x^2) = 4.9\\\\Var(x) = E(x^2) - (E(x))^2 = 4.9-(2.1)^2 = 0.49\\\\\sigma(x) = \sqrt{Var(x)} =\sqrt{0.49} = 0.7$

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3 years ago

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