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3 years ago

Trigonometry help questions in attachment

Mathematics

1 answer:

zavuch27 [327]3 years ago

6 0

Use the law of sines....

sin51/x=sin90/67

x=(67sin51)/sin90

x=52.07

....

tan39=(h-1.8)/44

h-1.8=44tan39

h=44tan39+1.8

h=37.4 m

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viktelen [127]

Answer:

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3 years ago

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For f(x) = square root of x, estimate f(17) to the nearest integer.

Tomtit [17]

f(x) = sqrt(x)

f(17) = sqrt(17)

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3 years ago

A manager at a local company asked his employees how many times they had given blood in the last year. The results of the survey

Lubov Fominskaja [6]

Answer:

$Var(X) = E(X^2) -[E(X)]^2 = 4.97 -(1.61)^2 =2.3779$

And the deviation would be:

$Sd(X) =\sqrt{2.3779}= 1.542 \approx 1.54$

Step-by-step explanation:

For this case we have the following distribution given:

X 0 1 2 3 4 5 6

P(X) 0.3 0.25 0.2 0.12 0.07 0.04 0.02

For this case we need to find first the expected value given by:

$E(X) = \sum_{i=1}^n X_i P(X_I)$

And replacing we got:

$E(X)= 0*0.3 +1*0.25 +2*0.2 +3*0.12 +4*0.07+ 5*0.04 +6*0.02=1.61$

Now we can find the second moment given by:

$E(X^2) =\sum_{i=1}^n X^2_i P(X_i)$

And replacing we got:

$E(X^2)= 0^2*0.3 +1^2*0.25 +2^2*0.2 +3^2*0.12 +4^2*0.07+ 5^2*0.04 +6^2*0.02=4.97$

And the variance would be given by:

$Var(X) = E(X^2) -[E(X)]^2 = 4.97 -(1.61)^2 =2.3779$

And the deviation would be:

$Sd(X) =\sqrt{2.3779}= 1.542 \approx 1.54$

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4 years ago

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Amiraneli [1.4K]

Answer:

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Step-by-step explanation:

You get a straight line. As you can see in the picture, the figure lies in the first and third quadrant.

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qwelly [4]

Answer:

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Step-by-step explanation:

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