Question

**The mean number of days it rained in the month of August
for a 5-year period at a local airport was 7 with a standard
deviation of 2. The average amount of rainfall during that same
month and period at that airport was 9 inches with a standard
deviation of 3 inches.**

Which variable has the lower relative variation?

amount of rainfall

number of days it rained

amount of rainfall but not the number of days it rained |

neither

**QQQQ**

The following stem-and-leaf plot represents a sample of exam
scores.

Exam Scores

4 | 5 6 8

5 | 3 4 5 6 9

6 | 2 3 5 6 6 9 9

7 | 0 1 1 3 3 4 5 5 5 7 8

8 | 1 2 3 6 9

9 | 3 5 7 8

The interquartile range for the examination scores is

**QQQQ**

The following stem-and-leaf plot represents a sample of exam
scores.

Exam Scores

4 | 5 6 8

5 | 3 4 5 6 9

6 | 2 3 5 6 6 9 9

7 | 0 1 1 3 3 4 5 5 5 7 8

8 | 1 2 3 6 9

9 | 3 5 7 8

The mean absolute deviation for the examination scores is

**QQQ**

The following are given for a set of values:

I. The values ranged from 40 to 95.

II. The median value was 79.

III. 25 percent of the values are less than or equal to a value of
60.

IV. 75 percent of the values are less than or equal to 87.

From the above information, the third quartile for the data set
is

Answer #1

1. Relative deviation = standard deviation / mean

Relative deviation of amount of rainfall = 3/9 = 0.33

Relative deviation of number of days it rained = 2/7 = 0.285

Thus b) number of days it rained has lower relative deviation.

2. From stem and leaf plot, we see number of exam scores are 35 i.e. n= 35

Lower quartile = (n+1)/4 th number = 9th number = 62

Upper quartle = 3(n+1)/4 th number = 27th number = 81

Inter quartile range = upper quartile - lower quartile = 81-62 = 19

The following stem-and-leaf plot represents a sample of exam
scores.
Exam Scores
4 | 5 6 8
5 | 3 4 5 6 9
6 | 2 3 5 6 6 9 9
7 | 0 1 1 3 3 4 5 5 5 7 8
8 | 1 2 3 6 9
9 | 3 5 7 8
The variance & coefficient of variation for the examination
scores is
QQQQ

Stem
Leaf
2
6
3
0, 7
4
0, 2, 6
5
1, 5, 7, 9, 9
6
0, 2, 5, 8
1) standard deviation:
2)Find Five-number summary of the data set
3). Draw a box plot that represents the data set

2. Below is the stem-plot of an exam score: Stem-and-leaf of
First Exam N = 31
Stem Leaves
5 | 58
6 | 058
7 | 00235558
8 | 0001355557
9 | 00023338
Unit=1
a. 2pts. Find the median and mode
b. 1pt. Find the range of the data values.

Here is a data set summarized as a stem-and-leaf plot:
3
00024677779
4
0003445677888899
5
04456
6
669
How many data values are in this data set? n=n=
What is the minimum value in the last class?
What is the minimum value in the entire sample?
How many of the original values are greater than 40?
The test scores for two algebra classes are shown in the Stem
and Leaf below.
Test Scores
Period 9
Period 10
9 8 2...

Using the following stem & leaf plot, find the five number
summary for the data by hand. 1|7 7 2|2 6 6 3|2 6 4|2 6 9 9 5|8 8 8
9 9 6|1 2 Min= ______ Q1=_______ Med=______ Q3=_______
Max=______

A stem-and-leaf plot is presented to answer the following
question.
+
Stem
Leaf Plot
4
4 5 9
5
0 2 3 3 4 4 6 7 7 7 8
6
1 2 2 3 4 7 8 9
7
0 1 1 2 3 4 4 5 6 6 8 9
8
0 1 3 5
Question 12
The value of 57 is represented on the stem and leaf graph, _____
times.
1) 4
2) 5
3) 3
4)...

The ages in years of 21 people in a swimming pool are displayed
in the stem-and-leaf plot. Determine the median age of people in
the pool.
0
2
4
5
6
7
8
8
8
1
0
3
7
9
2
2
4
7
3
6
4
1
2
4
5
6
4
8
median =
years

The ages of 11 students enrolled in an on-line macroeconomics
course are given in the following steam-and-leaf display:
Stem
Leaf
-----
-----------------------
1
9 9
2
1 5 5 8
9
3
0 1 2
4
0
Here 1|9 implies 19 years (i.e. the stem represents tens and
leaf represents units).
The standard deviation of the age distribution
is years. [Answer up to four digits after decimal]
Incorrect.
Tries 2/3
Previous Trie

Using the following stem & leaf plot, find the five number
summary for the data by hand. 1|7 8 2|0 1 3 3|0 1 4|0 3 3 4 5|0 1 3
4 4 6|1 1

1- the number of days a patient was hospitalized with a
diagnosis of traumatic injury were recorded as follows:
20 19 18 18 17 17 17 15 15 14 14 14 13 13 12 11 11 10 10
10
10 9 9 8 8 8 8 8 7 7 7 6 6 6 6 6 6 6 5 5 5 5 5 5 5 5 4
4 4 4 4 4 4 3 3 3 3 3 3 2 2...

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