3 years ago

In a class of 200 student ,

Mathematics

1 answer:

ivolga24 [154]3 years ago

6 0

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Find the variance of this probability distribution. Round to two decimal places.

attashe74 [19]

Answer:

Variance = 4.68

Step-by-step explanation:

The formula for the variance is:

$\sigma^{2} =\frac{\Sigma(X- \mu)^{2}}{N} \\or \\ \sigma^{2} =\frac{\Sigma(X)^{2}}{N} -\mu^{2} \\$

Where:

$X: Values \\\mu: Mean \\N: Number\ of\ values$

The mean can be calculated as each value multiplied by its probability

$\mu = 0*0.4 + 1*0.3 + 2*0.1+3*0.15+ 4*0.05=1.15$

$\frac{\Sigma (X)^{2}}{N} =\frac{(0^{2}+1^{2}+2^{2}+3^{2}+4^{2})}{5} =6$

Replacing the mean and the summatory of X:

$\sigma^{2} = \frac{\Sigma(X)^{2}}{N} -\mu^{2} \\= 6 - 1.15^{2}\\= 4.6775$

4 0

4 years ago

How many times does 73 go into 141

tatiyna

Divide 141 by 73

73 only goes into 141 once

6 0

3 years ago

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PLEASE HELP WILL MARK BRAINLIEST IF CORRECT

aksik [14]

Answer:

I think 3

Step-by-step explanation:

i think 3

for real this time

3 0

3 years ago

For what real life situation might you calculate -8 + 12

Rashid [163]

Answer:

<h3>When u have a bank account and are 8 dollars below proficiency and you add 12 dollars to your bank account</h3>

Step-by-step explanation:

add 12 to -8

3 0

3 years ago

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A box of snacks-size cracker packs weighs 28 1/2 ounces. Each snack pack weighs 4 3/4 ounces. How many snack packs are in the bo

NISA [10]

Six because 28.5 divided by 4.75 is six

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3 years ago

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In a class of 200 student , ​

In a class of 200 student ,