One fence costs 90cents. It take s ten boards to build 5 ft of fence. How many boards are needed to build 50 feet of fence?
1 answer:
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Usando el concepto del área del triángulo, se encuentra que :
- La altura es de 16.97 unidades.
- La base es de 50.91 unidades.
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El área del triángulo de base b y altura h es dada por:
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- El area es de <u>432 unidades quadradas</u>, o sea,
- La base mide <u>tres veces su altura</u>, o sea,
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<u>Reemplazando en la ecuación para el área</u>, es posible encontrar la altura:
La altura es de 16.97 unidades.
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La base es dada <u>en funcion da altura,</u> o sea:
La base es de 50.91 unidades.
Se da un problema similar en brainly.com/question/23931350
Answer:
The lower value for a 98% confidence interval for the true mean checking account balance for local customers is of $451.2.
Step-by-step explanation:
We have the standard deviation for the sample, which means that the t-distribution is used 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 = 14 - 1 = 13
98% confidence interval
Now, we have to find a value of T, which is found looking at the t table, with 13 degrees of freedom(y-axis) and a confidence level of . So we have T = 2.65
The margin of error is:
In which s is the standard deviation of the sample and n is the size of the sample.
The lower end of the interval is the sample mean subtracted by M. So it is 664.14 - 212.94 = $451.2.
The lower value for a 98% confidence interval for the true mean checking account balance for local customers is of $451.2.