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2 years ago

7

Last week, the members of a weight loss support group collectively weighed 2,900 pounds. They just weighed in again and are now

4% lighter. What is the group's current weight?

1 answer:

Doss [256]2 years ago

3 0

Answer:

2,784 lbs

Step-by-step explanation:

2900/100=29 (that is 1% of the 2900)

29*4=116 (that is 4% of 2900; how much weight they lost)

2900-116=2784 (current weight)

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Which two values of x are roots of the polynomial below? <br> 2+5=7

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2 years ago

Order these from least to greatest:<br><br> |–15|, |4|, –|15|, |–5|

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2 years ago

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3 years ago

Find the variance of the following data. Round your answer to one decimal place. x 1 2 3 4 5 P(X=x) 0.3 0.2 0.2 0.1 0.2

Reptile [31]

The variance of a distribution is the square of the standard deviation

The variance of the data is 2.2

<h3>How to calculate the variance</h3>

Start by calculating the expected value using:

$E(x) = \sum x* P(x)$

So, we have:

$E(x) = 1 * 0.3 + 2* 0.2 +3 * 0.2 + 4 * 0.1 + 5 * 0.2$

This gives

$E(x) = 2.7$

Next, calculate E(x^2) using:

$E(x^2) = \sum x^2* P(x)$

So, we have:

$E(x^2) = 1^2 * 0.3 + 2^2* 0.2 +3^2 * 0.2 + 4^2 * 0.1 + 5^2 * 0.2$

$E(x^2) = 9.5$

The variance is then calculated as:

$Var(x) = E(x^2) - (E(x))^2$

So, we have:

$Var(x) = 9.5 - 2.7^2$

$Var(x) = 2.21$

Approximate

$Var(x) = 2.2$

Hence, the variance of the data is 2.2

Read more about variance at:

brainly.com/question/15858152

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1 year ago