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ValentinkaMS [17]
2 years ago
7

The final exam scores in a statistics class were normally distributed with a mean of

Mathematics
1 answer:
IRISSAK [1]2 years ago
4 0

Answer:

68.27%

Step-by-step explanation:

By the Empirical Rule, as 65% and 75% are both one standard deviation apart from the mean of 70%, then this represents 68.27% of the data.

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The first side of a triangle is twice the length of the second side; the third side is 20 feet less than three times the second
oee [108]
Let the second side be x

then,
first side = twice the length of the second side
= 2x

third side = 20 feet less than three times the second side
3 (second side ) - 20
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= 6x - 20

perimete of a triangle = sum of all sides,

substitute the values we know,
and you'll be left with this equation

106 = x + 2x + 6x - 20
106+ 20 = 9x
126 = 9x
126/9 = x
14 = x

so,

measure of second side = x = 14 feet

measure of first side = 2x = 2 (14) = 28 feet

measure of thurd side = 6x - 20 = 6 (14)-20 = 84- 20 = 64 feet.
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Given ABD =≈ CBD
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Step-by-step explanation:

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2 years ago
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Which pair of angles add up to 180 degrees?
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Find x so that b ll e??????
tekilochka [14]

x=6


(6x+4) = (8x-8)


∠3 and ∠6 have to be equal since they are opposite interior angles (these angles are always equal to each other). Opposite interior angles prove that two lines are parallel if they are equal, so you just set them equal to each other and solve for x.


(6x+4) = (8x-8)

-6x -6x

4 = (2x-8)

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/2 /2

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CHECK

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(36+4) = (48-8)

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2 years ago
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