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s344n2d4d5 [400]
3 years ago
15

F Jessie is 24 years younger than her mother and if the sum of their ages is 84, how old is Jessie?

Mathematics
2 answers:
Ad libitum [116K]3 years ago
8 0
Jessie would be 60 yrs old. 84-24=60
kenny6666 [7]3 years ago
6 0
Well I did the math and I’m hoping it’s corrected but my answer was 36
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Answer:

Confidence interval: (21.9, 32.9).

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

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Now, we have to find a value of T, which is found looking at the t table, with 25 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.98}{2} = 0.99. So we have T = 2.485

The margin of error is:

M = T\frac{s}{\sqrt{n}} = 2.485\frac{11.2}{\sqrt{26}} = 5.5

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The lower end of the interval is the sample mean subtracted by M. So it is 27.4 - 5.5 = 21.9 hours

The upper end of the interval is the sample mean added to M. So it is 27.4 + 5.5 = 32.9 hours

Confidence interval: (21.9, 32.9).

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