27. Suppose X is unimodal and symmetric with mean 10 and standard deviation 1. Answer the following questions with the help of Figure 7.7. Figure 7.7: The Empirical Rule (a) Approximately, what percent of observa- tions are between 9 and 11? (b) Approximately, what percent of observa- tions are between 9 and 12? (c) Approximately what percent of observa- tions are less than 9? (d) Approximately what percent of observa- tions are greater than 13? (e) What is the 84th percentile for X? X: 7 (f) What is the 16th percentile for X? 10 11 12 13 Z: -3 -2 -1 3

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27. Suppose X is unimodal and symmetric with mean 10 and standard deviation 1. Answer the
following questions with the help of Figure 7.7.
Figure 7.7: The Empirical Rule
(a) Approximately, what percent of observa-
tions are between 9 and 11?
(b) Approximately, what percent of observa-
tions are between 9 and 12?
(c) Approximately what percent of observa-
tions are less than 9?
(d) Approximately what percent of observa-
tions are greater than 13?
(e) What is the 84th percentile for X?
X: 7
(f) What is the 16th percentile for X?
10
11
12
13
Z: -3
-2
-1
3
Transcribed Image Text:27. Suppose X is unimodal and symmetric with mean 10 and standard deviation 1. Answer the following questions with the help of Figure 7.7. Figure 7.7: The Empirical Rule (a) Approximately, what percent of observa- tions are between 9 and 11? (b) Approximately, what percent of observa- tions are between 9 and 12? (c) Approximately what percent of observa- tions are less than 9? (d) Approximately what percent of observa- tions are greater than 13? (e) What is the 84th percentile for X? X: 7 (f) What is the 16th percentile for X? 10 11 12 13 Z: -3 -2 -1 3
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