Elementary Statistics Name:. Study Guide 7 Class: Due Date: Score:. No Work No Points Use Pencil Only Be Neat & Organized 1. A sample has a bell-shaped distribution with the mean of 78 and standard devi- ation of 6. Using the empirical rule, About 68% Of the data falls (a) Within 72 and 84 (a) (2 points) Find its 68% range. X-S 78- =72 メ+8= 78+ = 84 (b) (3 points) Find its usual range. -25 = 78-216)= 66 ヌ+25 = 78+216)= 90 About 95%. of the data falls %3D %3D (b) \within 66 and 90 (c) (2 points) What percentage of this sample fall bellow 90? (c) 2. The age of 35 randomly selected drivers at the time of accident is given below: 35 42 18 25 20 36 49 24 37 23 24 30 45 38 35 30 37 40 25 28 37 50 47 48 30 32 48 40 45 39 50 40 42 48 (a) (3 points) Construct the stem plot. Stem(tens) | Leaf(units) a 00344558 3000255o 77789 4000225578889 500 Page 1 of 4 Study Guide 7 Total Points: 50

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Im confused on #1.) Letter C. I already found the 68% range and the 95% range by using the empirical rule. Now it is asking " What percentage of this sample fall bellow 90? With the mean of 78 and standard deviation of 6. 

Elementary Statistics
Name:.
Study Guide 7
Class:
Due Date:
Score:.
No Work No Points
Use Pencil Only Be Neat & Organized
1. A sample has a bell-shaped distribution with the mean of 78 and standard devi-
ation of 6. Using the empirical rule,
About 68% Of the data
falls
(a) Within 72 and 84
(a) (2 points) Find its 68% range.
X-S 78- =72
メ+8= 78+ = 84
(b) (3 points) Find its usual range.
-25 = 78-216)= 66
ヌ+25 = 78+216)= 90
About 95%. of the data falls
%3D
%3D
(b) \within 66 and 90
(c) (2 points) What percentage of this sample fall bellow 90?
(c)
2. The age of 35 randomly selected drivers at the time of accident is given below:
35
42 18 25
20 36 49
24 37
23
24 30 45 38 35
30 37
40
25
28 37
50
47 48
30
32 48
40 45
39
50 40 42 48
(a) (3 points) Construct the stem plot.
Stem(tens) | Leaf(units)
a 00344558
3000255o 77789
4000225578889
500
Page 1 of 4
Study Guide 7
Total Points: 50
Transcribed Image Text:Elementary Statistics Name:. Study Guide 7 Class: Due Date: Score:. No Work No Points Use Pencil Only Be Neat & Organized 1. A sample has a bell-shaped distribution with the mean of 78 and standard devi- ation of 6. Using the empirical rule, About 68% Of the data falls (a) Within 72 and 84 (a) (2 points) Find its 68% range. X-S 78- =72 メ+8= 78+ = 84 (b) (3 points) Find its usual range. -25 = 78-216)= 66 ヌ+25 = 78+216)= 90 About 95%. of the data falls %3D %3D (b) \within 66 and 90 (c) (2 points) What percentage of this sample fall bellow 90? (c) 2. The age of 35 randomly selected drivers at the time of accident is given below: 35 42 18 25 20 36 49 24 37 23 24 30 45 38 35 30 37 40 25 28 37 50 47 48 30 32 48 40 45 39 50 40 42 48 (a) (3 points) Construct the stem plot. Stem(tens) | Leaf(units) a 00344558 3000255o 77789 4000225578889 500 Page 1 of 4 Study Guide 7 Total Points: 50
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