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marishachu [46]
3 years ago
10

sheila is climbing on a ladder that is attached against the side of a jungle gym wall. she is 5 feet off the ground and 3 feet f

rom the base of the ladder, which is 15 feet from the wall.how high up the wall is the top of the ladder?
Mathematics
1 answer:
Alchen [17]3 years ago
7 0
The ladder is leaning against the wall, the information you're given, being that she's 5 feet up and 3 feet from the wall shows that every 3 feet she moves on the ladder, she moves up 5 feet, the ladder is 15 feet away from the wall so 15/3 is 5 multiply that by 5 to get the total length of the ladder, which is 25. Then use Pythagorean theorem (A^2 + B^2 = C^2)
15 would be the A or B value because it's the distance from the wall, the C value, or the hypotenuse would be 25 because it's the total length of the ladder, replace the variables so you get A^2 + 15^2 =25^2 then square the integers, and get A^2 + 225 = 625, subtract 225 from each side and you're left with A^2 = 400, take the square root of each side (√A^2 = √400) and you're left with your answer of A=20
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ExtremeBDS [4]

Answer:

The critical value that should be used in constructing the interval is T = 5.8408.

The 99% confidence interval for the true mean yield is between 2.943 bushels per acre and 96.268 bushels per acre.

Step-by-step explanation:

We have the standard deviation of the sample, so we use the students t-distribution to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 4 - 1 = 3

99% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 3 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.99}{2} = 0.995. So we have T = 5.8408. This is the critical value.

The margin of error is:

M = T*s = 5.8408*7.99 = 46.668 bushels per acre

In which s is the standard deviation of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 49.6 - 46.668 = 2.943 bushels per acre.

The upper end of the interval is the sample mean added to M. So it is 49.6 + 46.668 = 96.268 bushels per acre.

The 99% confidence interval for the true mean yield is between 2.943 bushels per acre and 96.268 bushels per acre.

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