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sweet [91]
3 years ago
11

Really needing help with this problem

Mathematics
2 answers:
Sveta_85 [38]3 years ago
7 0

Answer:

z = 80

Step-by-step explanation:

A quadrilateral has angles that sum to 360 degrees

E + C+ G+F = 360

100+60+120+F = 360

Combine like terms

280+F = 360

F = 360-280

F = 80

We know that ABCD is similar to FECG

That means  the measure of A =  measure of F

z = 80

hjlf3 years ago
6 0

Answer:60

Step-by-step explanation:

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3 0
3 years ago
The amount of time a certain brand of light bulb lasts is normally distribued with a mean of 1800 hours and a standard deviation
DedPeter [7]

Answer: 68% of light bulbs last between 1765 hours and 1835 hours.

Step-by-step explanation:

The empirical rule states that for a normal distribution, nearly all of the data will fall within three standard deviations of the mean . The empirical rule is further illustrated below

68% of data falls within the first standard deviation from the mean.

95% fall within two standard deviations.

99.7% fall within three standard deviations.

From the information given, the mean is 1800 hours and the standard deviation is 35 hours.

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1800 - 35 = 1765 hours

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