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3 years ago

9

The pie chart to the right shows how adults rate their financial shape. suppose 4 people are chosen at random from a group of 12

001200. what is the probability that all four would rate their financial shape as excellent

1 answer:

Bad White [126]3 years ago

5 0

Excellent 9%

Good 41%

Fair 36%

Poor 13%

Other 1%

I don't know if this will help but.

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$Var(X) = E(X^2) -[E(X)]^2 = 4.97 -(1.61)^2 =2.3779$

And the deviation would be:

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Step-by-step explanation:

For this case we have the following distribution given:

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P(X) 0.3 0.25 0.2 0.12 0.07 0.04 0.02

For this case we need to find first the expected value given by:

$E(X) = \sum_{i=1}^n X_i P(X_I)$

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Now we can find the second moment given by:

$E(X^2) =\sum_{i=1}^n X^2_i P(X_i)$

And replacing we got:

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$Var(X) = E(X^2) -[E(X)]^2 = 4.97 -(1.61)^2 =2.3779$

And the deviation would be:

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