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3 years ago

Please help me i’m so confused

Mathematics

1 answer:

Ratling [72]3 years ago

3 0

If the angles on this diagram were labeled this would be a lot easier to describe, but here goes...
We need to find the angle they are calling “1”, at the bottom of the triangle on the far left of the diagram. In order to find that angle, we have to find the other 2 angles first.
The top left corner of the diagram is marked as a right angle (90 degrees) with a line dividing that angle. If one part is 36 degrees, the other is 54 (90-36=54).
Now look in the middle of the diagram where the 2 lines criss-cross. A straight line is 180 degrees...since we see that the one angle in the middle is 88 degrees, the other part of it must be 92 degrees (180-88=92).
You now know 2 of the 3 angles...54 and 92. All 3 angles of a triangle = 180 degrees so we can write this equation...
54 + 92 + (angle 1) = 180
So angle “1” = 34 degrees

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3 years ago

Life tests on a helicopter rotor bearing give a population mean value of 2500 hours and a population standard deviation of 135 h

stira [4]

Answer:

The percent of the parts are expected to fail before the 2100 hours is 0.15.

Step-by-step explanation:

Given :Life tests on a helicopter rotor bearing give a population mean value of 2500 hours and a population standard deviation of 135 hours.

To Find : If the specification requires that the bearing lasts at least 2100 hours, what percent of the parts are expected to fail before the 2100 hours?.

Solution:

We will use z score formula

$z=\frac{x-\mu}{\sigma}$

Mean value = $\mu = 2500$

Standard deviation = $\sigma = 135$

We are supposed to find If the specification requires that the bearing lasts at least 2100 hours, what percent of the parts are expected to fail before the 2100 hours?

So we are supposed to find P(z<2100)

so, x = 2100

Substitute the values in the formula

$z=\frac{2100-2500}{135}$

$z=−2.96$

Now to find P(z<2100) we will use z table

At z = −2.96 the value is 0.0015

So, In percent = $.0015 \times 100=0.15\%$

Hence The percent of the parts are expected to fail before the 2100 hours is 0.15.

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3 years ago

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Answer:

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3 years ago

Read 2 more answers

Which is larger 4 yard or 13 foot?

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As 1 yard is equal to 3 feet , so 4 yard will be 12 feet !

so 13 foot > 4 yards

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3 years ago