- Answers may vary. Sample:
Ages of Relatives
, 8
6
§■ 4
LL. 2 7L
0
£ f
- ^ £ <§ > < &
Age
- Answers may vary. Sample:
Points Per Game - Answers may vary. Sample:
0-9 10-19 20-29 30-39
Points- symmetric 17. skewed
- Answers may vary. Sample:
Heights of Buildings
Feet FrequencyN
Cumulative
Frequency
( 100-149 2 2 ]
[ 150-199 35 Ji 2 0 0 - 2 4 9 (^38) J
I 250-299 2 10 ]
300-349 (^212) I
21a. The Perpendicular Bisectors
Time/Song
(min) Frequency
Cumulative
Frequency
f 0-1:19 0 0 ]
1:20-2:39 2 2 ]
I 2 : 4 0 - 3 : 5 9 5 7 j
4:00-5:19 3 10 J
I y
b. 70%; 7 out of 10 songs are shorter than 4 min.
- Answers may vary. Sample:
Test Scores
£ 1
Lj— I
<?>' <§>'A*'A<'
ScoresScores- $99 29. 9 customers 31. There were no numbers in
the range of 30 to 39 so the student just left out this
interval. The intervals in a frequency table should not
have any gaps, so the student should have included the
interval 30-39.
c
Interval Frequency
20-29 6
30-39 0
40-49 5
50-59 4
I - Frequencies in the second column are 6, 11, 9, 9 35. F
- Methods may vary. Sample: Graph the two functions
using a graphing calculator. Use the trace and intersect
features to find the intersection. Since x ~ 1.77, th e x
value where the two graphs intersect is between 1 and 2.
38.'12 16' '-2 .1 -5.3'
39.
.14 18.. - 6. 7 -0.5. 40.-16, -4 , 0,1 |,
2, 13, 16 41.-1, - 0 .2 , 0, 0.1, 0.9, 1.2, 2, 5
Lesson 12-3 pp. 738-744
Go t It? 1. 112.4, 109, 104; mean 2a. 88% b. No; you
would need a grade of 104. 3. Stock C: 6, 4.2; Stock D:
22, 11.2; Stock C had a range of 6 and a mean of 4.2,
while Stock D had a range of 22 and a mean of 10.8 for
this 5-day period. 4a. mean: 20.8; median: 21; range: 5
b. You can use the line plot to see whether the data are
symmetric. If they are, then the mean and median are
equal; if they are not, then the mean and median are not
equal. 5a. less than b. less than c. The data for Class C
are shifted left when compared to the data for Class A.
Therefore the mean will be less.
Lesso n Ch eck 1. 26.2, 30.5, 33; the median, since
there is an outlier in this set 2. 8.76, 8.8, no mode; the
mean, since there is no outlier 3. 94 4. All are describing
the data set by finding a representative measure of central
tendency. The mean can be influenced by outliers, which
can overstate or understate the measure. The median is thec
Po w erAlg eb ra.com Selected Answers