3 years ago

Solving quadratic equations using square roots

Mathematics

1 answer:

masya89 [10]3 years ago

8 0

Answer:

i hope you understand this

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Step-by-step explanation:

cuz 29 - 4 - 2 = 27

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If I earn $15/hour and work for 20 hours/week, how much would I earn in one

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$1,200

Step-by-step explanation:

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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:

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

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Give four pairs of prime numbers whose difference is 2

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Answer:

(3, 1) (5, 3) (7, 5) (13, 11)

Step-by-step explanation:

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