Evaluate the expression solve for b = 15 19.9 + 2b =
2 answers:
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Answer:
628
Step-by-step explanation:
We have the standard deviation of the sample, so we use the 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 = 12 - 1 = 11
95% confidence interval
Now, we have to find a value of T, which is found looking at the t table, with 11 degrees of freedom(y-axis) and a confidence level of . So we have T = 2.2
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 665 - 37 = 628 hours.
The answer is 628
Answer:
The height of tower .
Step-by-step explanation:
Diagram of the given scenario is shown below.
Given that,
Distance between John and tower is .
Angle of elevation to the top of the tower is °.
Height of John is .
To Find: Height of the tower .
So,
In triangle ΔDCE,
(∠
Now,
To calculate the height of tower we have
≈
Therefore,
The height of tower .
