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mario62 [17]
3 years ago
8

Two grain-collecting machines can collect all the grain from a field 9 days faster than if the first one was doing it alone and

4 days faster than if the second one was working alone. How long does it take each grain-collecting machine to collect all the grain by itself?
Mathematics
1 answer:
Paul [167]3 years ago
7 0
I would say the answer would be 36
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Your start-up business is looking into the energy usage in the community of south lawndale. your sample size is 12 months. use t
Aleonysh [2.5K]

The confidence interval at 95% level is

7106.87 <  μ< 14255.27

<h3>What is meant be mean and standard deviation?</h3>

The ratio of sum of observations to the total number of observation is known as mean. It is one of the central tendency in the statistics. It gives an idea about the central value present in the data. The most sensitive measure of central tendency is mean. It is very easy to calculate. Mean playa a crucial role in daily life. The two types of means are Arithmetic mean and Geometric mean.

Standard deviation is a measure in the statistics. The amount of variation of a set of values is known as standard deviation. Standard deviation is denoted by σ.

As per given data

90% confident level for amount of electricity used in community of Austin is

X-tx/2(n-1)s/√n < μ < X+ tx/2(n-1)s/√n

Here , n=12 ,  X=10681.07 , s=6893.87

Margin of error = tx/2(n-1)s/√n

=(1.796×6893.87)/√12

=3574.1996

=3574.19(approximately)

Therefore, 90% CI is,

10681.07-3574.19 ≤ μ<10681.07+3574.19

7106.87 <  μ< 14255.27

To know more about mean and standard deviation, visit:

brainly.com/question/14720855

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Anyone know answer for number 4? My brain just isn’t working today hahaa
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Answer:

y=-6/5x + 1

Step-by-step explanation:

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The answer is h=15+9/3=8
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Answer: roughly 40 percent

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60 Benjamin bought 6.2 pounds of rice. Each pound cost<br> $0.90. How much did he spend on rice?
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Answer:

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