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The table below will be used for the following five questions. The table represents the mean and standard deviation graduation rates, by candidate age, for
The table below will be used for the following five questions. The table represents the mean and standard deviation graduation rates, by candidate age, for a population of flight academies.
Age | Mean Graduation Rate | Standard Deviation |
16 | 76.6 | 1.8 |
17 | 74.2 | 1.8 |
18 | 79.5 | 1.7 |
19 | 79.6 | 2.1 |
20 | 81.2 | 2.1 |
21 | 84.2 | 2.2 |
22 | 85.5 | 2.1 |
23 | 88.5 | 1.4 |
24 | 86.5 | 1.5 |
25 | 87.7 | 1.9 |
26 | 87.8 | 1.5 |
27 | 88.1 | 1.6 |
28 | 89.8 | 1.8 |
29 | 90.1 | 1.8 |
30 | 87.8 | 2.3 |
31 | 88.3 | 2.2 |
32 | 88.3 | 1.7 |
33 | 84.5 | 1.9 |
34 | 85.1 | 1.6 |
35 | 88.1 | 1.4 |
36 | 88.2 | 1.5 |
37 | 86.5 | 1.4 |
38 | 84.5 | 1.8 |
39 | 88.8 | 1.9 |
40 | 84.4 | 1.6 |
- A flight academy boasts it is among the top 10% for graduation rates among its 25-year old candidates. This academy's graduation rate is 89.1 over the last two years for 25-year old candidates. Is the claim that this flight academy is in the top 10% a true statement? Explain.
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