3 years ago

What is the value of x

Mathematics

1 answer:

Ann [662]3 years ago

5 0

X=62 degrees because it has to add up to 90 degrees

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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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4 years ago

Kelly is knitting a scarf for her brother in it to 1/3 hour to knit 3/4 foot of the scarf how fast is Kelly in knitting feet per

Naily [24]

I think the answer is 2.25 or 2 and 1/4.

You divide 3/4 by 1/3 and get 2.25 or 2 and 1/4.

I don't know if this is right, I hope it is, have a good day. c;

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3 years ago

QUESTION 1 of 10: Generally, parties of 8 or more require many restaurants to include gratuity of 18% on the check before presen

katen-ka-za [31]

Answer: D) 49.86

276.99 x .18 (or 18%) = 49.8582

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3 years ago

What are the terms of each expression 3a-19

laiz [17]

Hope this is what you were looking for:)

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3 years ago

Read 2 more answers

What is the linear function equation represented by the graph?

Tom [10]

Answer:

Y= -1/2x + 1

Step-by-step explanation:

The equation for a line is Y=Mx+B

M stands for the Slope.

-Slope is rise/run. So, for this graph the line "rises" 1 point and "runs" left 2 points until meeting the line again. This slope is negative because it "runs" to the left.

B stands for the Y-Intercept

-The Y-intercept is the point at which the line crosses the Y axis. For this example, the line crosses the Y-intercept at (0,1).

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4 years ago