Answer:
W=38t
Step-by-step explanation:
4a + 5a - 15 = 2 + 3a
6a = 17
a = 17/6
Using the t-distribution, the 90% confidence interval for the mean number of absences is given by: (9.22, 11.60).
<h3>What is a t-distribution confidence interval?</h3>
The confidence interval is:

In which:
is the sample mean.
- s is the standard deviation for the sample.
The critical value, using a t-distribution calculator, for a two-tailed 90% confidence interval, with 28 - 1 = 27 df, is t = 1.7033.
Researching this problem on the internet, the parameters are given by:
.
Hence the bounds of the interval are given by:
The 90% confidence interval for the mean number of absences is given by: (9.22, 11.60).
More can be learned about the t-distribution at brainly.com/question/16162795
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Answer:
(-2,5) is vertex ; y-intercept (0,5) but the y-intercept is actually (0,-7).
Step-by-step explanation:
The vertex form of a quadratic is
where the vertex is (h,k). Here h=-2 and k=5. So the vertex is (-2,5).