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Anit [1.1K]
4 years ago
8

Someone help me with all these questions

Mathematics
1 answer:
Illusion [34]4 years ago
3 0
28. 220 yards is 660 feet and you have to multiply by 12 so you get 7920.

29. 100 feet is 1200.

30. You have to multiply by 12 to get feet and multiply by 3 to get yards and then you get 1728.

31. You have to multiply by 10 so you get 216.
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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.

5 0
3 years ago
On the Beach Cafe sells 140 cream sodas and earns $175.00. What is the unit price of the sodas? How much will On the Beach Cafe
kobusy [5.1K]
The unit price would be $1.25
Because:
175 ÷ 140 = 1.25

They would earn $312.50
Because:
1.25 × 250 = 312.5

<span>♡ Hope I helped </span>♡
4 0
3 years ago
Read 2 more answers
A boy can swim 75 feet in 12 seconds. What is his rate to the nearest mile per hour?
oee [108]
S=d/t so in this case it's 75/12 which is 6.25. Round it and you got 6 miles per hour.
7 0
4 years ago
Read 2 more answers
Suppose that a scientist estimates that every square mile of the ocean contains an average of 4.6 × 104 pieces of trash. the are
ryzh [129]
For this case we can make the following rule of three:
 1 square mile -------------------> 4.6 * 10 ^ 4 pieces of trash
 1.2 * 10 ^ 8 square miles -------> x
 From here, we clear the value of x:
 We have then:
 x = (1.2 * 10 ^ 8) * (4.6 * 10 ^ 4)
 x = 5.52 * 10 ^ 12 pieces of trash
 Answer:
 
there are 5.52 * 10 ^ 12 pieces of trash in the earth's oceans
5 0
3 years ago
ack is in hospital and his temperature is recorded every hour one morning. Time Temperature 06:00 40.0 07:00 40.0 08:00 39.5 09:
sukhopar [10]
I would say a line graph is probably the best way (it is usually the normal way) so that you can see the fluctations in temperature. Time on the x-axis and temp on the y-axis
4 0
3 years ago
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