3 years ago

A group of students worked in the school garden. The graph shows the number of hours the students worked

Mathematics

2 answers:

Viefleur [7K]3 years ago

7 0

A
Rirhrhhrjrjrjrjuriujfhc

xxMikexx [17]3 years ago

5 0

B. 2 hours
I believe it is

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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

4 0

2 years ago

Step 5 of the proof demonstrates which of the following?

galben [10]

Honey God loves u God bless u with that hw good luck

6 0

4 years ago

Remove all grouping symbols and combine like terms.

zubka84 [21]

$(3x+x^2)-\{4x^2-3x+[2x^2-x-(5x^2+4x)]\}\\\\=3x+x^2-\{4x^2-3x+[2x^2-x-5x^2-4x]\}\\\\=3x+x^2-\{4x^2-3x+[-3x^2-5x]\}\\\\=3x+x^2-\{4x^2-3x-3x^2-5x\}\\\\=3x+x^2-\{x^2-8x\}\\\\=3x+x^2-x^2+8x\\\\=11x$

5 0

3 years ago

Read 2 more answers

javier buys 3 postcards during each day of vacation. how many days will javier have to spend on vacation before he will have bou

storchak [24]

Answer: 6 days
explanation: 18/3=6

4 0

3 years ago

Solve 3(2x - 1) + 4x = 4(3x - 1) - 9

suter [353]

x = 5

Step-by-step explanation:

3 ( 2x - 1 ) + 4x = 4 ( 3x - 1 ) - 9
6x - 3 + 4x = 12x - 4 - 9
10x - 3 = 12x - 13
- 3 + 13 = 12x - 10x
10 = 2x
x = 10 / 2
x = 5

<h3>Hope it helps you ツ</h3>

6 0

2 years ago