Page 188 - TB_6B
P. 188
NUMINO
2 . a . There is no mode. Activity 1 P. 14~15
b . The modes are A and B. 1 . All of the students at your school.
3 . The mode is used to elect the class No
Use a sample because the population is large.
president because the person with the most
votes is elected as the class president. 2 . c . the students in Kate’s class
Answers may vary. the students in Kate’s class
Sample Answer
The mode can be used as a representative d . citizens
value for the election, a survey for the most
favorite color, blood type etc. people who were surveyed on the
telephone
Activity 4 P. 11 Activity 2 P. 16~17
1 . a . 2,640 480 430 2 1 . a . Random sampling
10 b . Not random sampling
420 3 450 470 510 = 667 Ann’s sample is a biased sample because it
10 excludes the girls, and Ryan’s sample is
$667 biased because it excludes the 2nd, 3rd, 4th,
5th, and 6th graders.
b . $440
c . $420 Activity 3 P. 18~20
1 . Convenience sampling
d . The median is the most appropriate 123456
Systematic sampling 7 8 9 10 11 12
representative value to represent the profit 13 14 15 16 17 18
of the shop because the mean is majorly Random sampling 19 20 21 22 23 24
affected by the profit in January, and the
mode is not appropriate to represent the 2 . a . Sample Answers
profit of the shop.
123456
2 . Some of the star players earn millions of 7 8 9 10 11 12
13 14 15 16 17 18
dollars, and other normal players get paid only 19 20 21 22 23 24
a small portion. But, due to the large amount
of income for star players, the average income
is high.
Unit 18. Perfect Samples 3 . a . Sample Answer
P. 12~13 Ask 30 of Ann’s close friends.
Method 3 would be the best to select
30 students because each student in the b . Sample Answer
population has an equal chance of being
selected. Ask 10 teachers from your school.
Answers 177
2 . a . There is no mode. Activity 1 P. 14~15
b . The modes are A and B. 1 . All of the students at your school.
3 . The mode is used to elect the class No
Use a sample because the population is large.
president because the person with the most
votes is elected as the class president. 2 . c . the students in Kate’s class
Answers may vary. the students in Kate’s class
Sample Answer
The mode can be used as a representative d . citizens
value for the election, a survey for the most
favorite color, blood type etc. people who were surveyed on the
telephone
Activity 4 P. 11 Activity 2 P. 16~17
1 . a . 2,640 480 430 2 1 . a . Random sampling
10 b . Not random sampling
420 3 450 470 510 = 667 Ann’s sample is a biased sample because it
10 excludes the girls, and Ryan’s sample is
$667 biased because it excludes the 2nd, 3rd, 4th,
5th, and 6th graders.
b . $440
c . $420 Activity 3 P. 18~20
1 . Convenience sampling
d . The median is the most appropriate 123456
Systematic sampling 7 8 9 10 11 12
representative value to represent the profit 13 14 15 16 17 18
of the shop because the mean is majorly Random sampling 19 20 21 22 23 24
affected by the profit in January, and the
mode is not appropriate to represent the 2 . a . Sample Answers
profit of the shop.
123456
2 . Some of the star players earn millions of 7 8 9 10 11 12
13 14 15 16 17 18
dollars, and other normal players get paid only 19 20 21 22 23 24
a small portion. But, due to the large amount
of income for star players, the average income
is high.
Unit 18. Perfect Samples 3 . a . Sample Answer
P. 12~13 Ask 30 of Ann’s close friends.
Method 3 would be the best to select
30 students because each student in the b . Sample Answer
population has an equal chance of being
selected. Ask 10 teachers from your school.
Answers 177
