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EleoNora [17]
3 years ago
15

Find the mean of the following data set: 40, 58, 37, 23, 66, 42, 35, 37, 51, 42, 56, 37, 61, 52.

Mathematics
1 answer:
svet-max [94.6K]3 years ago
6 0

Answer:

45.5

Step-by-step explanation:

To find the mean is to find the average number of the data set.

In order to do this you add up all of the numbers, then divide it by the value how many numbers are in the set.

40+58+37+23+66+42+35+37+51+42+56+37+61+52= 637/14=45.5

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Given b(x) = |x+4], what is b(-10)?<br> -10<br> -6<br> 8<br> 14
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Answer:

b(-10) = 6

Step-by-step explanation:

Step 1: Define

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Step 2: Substitute and Evaluate

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Given: cos θ=-4/5, sin x = -12/13, θ is in the third quadrant, 
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By definition of tangent,

tan(2<em>θ</em>) = sin(2<em>θ</em>) / cos(2<em>θ</em>)

Recall the double angle identities:

sin(2<em>θ</em>) = 2 sin(<em>θ</em>) cos(<em>θ</em>)

cos(2<em>θ</em>) = cos²(<em>θ</em>) - sin²(<em>θ</em>) = 2 cos²(<em>θ</em>) - 1

where the latter equality follows from the Pythagorean identity, cos²(<em>θ</em>) + sin²(<em>θ</em>) = 1. From this identity we can solve for the unknown value of sin(<em>θ</em>):

sin(<em>θ</em>) = ± √(1 - cos²(<em>θ</em>))

and the sign of sin(<em>θ</em>) is determined by the quadrant in which the angle terminates.

<em />

We're given that <em>θ</em> belongs to the third quadrant, for which both sin(<em>θ</em>) and cos(<em>θ</em>) are negative. So if cos(<em>θ</em>) = -4/5, we get

sin(<em>θ</em>) = - √(1 - (-4/5)²) = -3/5

Then

tan(2<em>θ</em>) = sin(2<em>θ</em>) / cos(2<em>θ</em>)

tan(2<em>θ</em>) = (2 sin(<em>θ</em>) cos(<em>θ</em>)) / (2 cos²(<em>θ</em>) - 1)

tan(2<em>θ</em>) = (2 (-3/5) (-4/5)) / (2 (-4/5)² - 1)

tan(2<em>θ</em>) = 24/7

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