Mathematics
Average / Arithmetic Mean
In a dataset of 17 values with mean 37, one observation is revised upward by 14. What is the revised mean?
A. 39.82
B. 36.82
C. 37.82
D. 38.82
Correct Answer: C
Total rises by 14; mean rises by 14/17. Revised mean = 37.82.
Mathematics
Average / Arithmetic Mean
In a dataset of 16 values with mean 36, one observation is revised upward by 12. What is the revised mean?
A. 35.75
B. 37.75
C. 38.75
D. 36.75
Correct Answer: D
Total rises by 12; mean rises by 12/16. Revised mean = 36.75.
Mathematics
Average / Arithmetic Mean
In a dataset of 15 values with mean 35, one observation is revised upward by 10. What is the revised mean?
A. 36.67
B. 37.67
C. 35.67
D. 34.67
Correct Answer: C
Total rises by 10; mean rises by 10/15. Revised mean = 35.67.
Mathematics
Average / Arithmetic Mean
The mean height of a group is 168 cm. What is the same mean expressed in metres?
A. 1.68 m
B. 1.58 m
C. 1.78 m
D. 1.88 m
Correct Answer: A
168 cm ÷ 100 = 1.68 m.
Mathematics
Average / Arithmetic Mean
The mean height of a group is 166 cm. What is the same mean expressed in metres?
A. 1.66 m
B. 1.76 m
C. 1.56 m
D. 1.86 m
Correct Answer: A
166 cm ÷ 100 = 1.66 m.
Mathematics
Average / Arithmetic Mean
The mean height of a group is 164 cm. What is the same mean expressed in metres?
A. 1.54 m
B. 1.64 m
C. 1.84 m
D. 1.74 m
Correct Answer: B
164 cm ÷ 100 = 1.64 m.
Mathematics
Average / Arithmetic Mean
The mean height of a group is 162 cm. What is the same mean expressed in metres?
A. 1.72 m
B. 1.52 m
C. 1.62 m
D. 1.82 m
Correct Answer: C
162 cm ÷ 100 = 1.62 m.
Mathematics
Average / Arithmetic Mean
The mean height of a group is 160 cm. What is the same mean expressed in metres?
A. 1.7 m
B. 1.8 m
C. 1.6 m
D. 1.5 m
Correct Answer: C
160 cm ÷ 100 = 1.6 m.
Mathematics
Average / Arithmetic Mean
The mean height of a group is 158 cm. What is the same mean expressed in metres?
A. 1.78 m
B. 1.48 m
C. 1.58 m
D. 1.68 m
Correct Answer: C
158 cm ÷ 100 = 1.58 m.
Mathematics
Average / Arithmetic Mean
The mean height of a group is 156 cm. What is the same mean expressed in metres?
A. 1.76 m
B. 1.46 m
C. 1.66 m
D. 1.56 m
Correct Answer: D
156 cm ÷ 100 = 1.56 m.
Mathematics
Average / Arithmetic Mean
The mean height of a group is 154 cm. What is the same mean expressed in metres?
A. 1.74 m
B. 1.44 m
C. 1.64 m
D. 1.54 m
Correct Answer: D
154 cm ÷ 100 = 1.54 m.
Mathematics
Average / Arithmetic Mean
The mean height of a group is 152 cm. What is the same mean expressed in metres?
A. 1.72 m
B. 1.42 m
C. 1.62 m
D. 1.52 m
Correct Answer: D
152 cm ÷ 100 = 1.52 m.
Mathematics
Average / Arithmetic Mean
The mean height of a group is 150 cm. What is the same mean expressed in metres?
A. 1.4 m
B. 1.5 m
C. 1.7 m
D. 1.6 m
Correct Answer: B
150 cm ÷ 100 = 1.5 m.
Mathematics
Average / Arithmetic Mean
Every observation in a dataset with mean 58 is decreased by 30%. What is the new mean?
A. 42.6
B. 44.6
C. 40.6
D. 38.6
Correct Answer: C
Mean decreases by the same 30%: 40.6.
Mathematics
Average / Arithmetic Mean
Every observation in a dataset with mean 56 is increased by 25%. What is the new mean?
A. 68
B. 70
C. 74
D. 72
Correct Answer: B
Mean increases by the same 25%: 70.
Mathematics
Average / Arithmetic Mean
Every observation in a dataset with mean 54 is decreased by 20%. What is the new mean?
A. 47.2
B. 45.2
C. 41.2
D. 43.2
Correct Answer: D
Mean decreases by the same 20%: 43.2.
Mathematics
Average / Arithmetic Mean
Every observation in a dataset with mean 52 is increased by 15%. What is the new mean?
A. 61.8
B. 57.8
C. 63.8
D. 59.8
Correct Answer: D
Mean increases by the same 15%: 59.8.
Mathematics
Average / Arithmetic Mean
Every observation in a dataset with mean 50 is decreased by 10%. What is the new mean?
A. 47
B. 49
C. 45
D. 43
Correct Answer: C
Mean decreases by the same 10%: 45.
Mathematics
Average / Arithmetic Mean
Every observation in a dataset with mean 48 is increased by 30%. What is the new mean?
A. 60.4
B. 62.4
C. 64.4
D. 66.4
Correct Answer: B
Mean increases by the same 30%: 62.4.
Mathematics
Average / Arithmetic Mean
Every observation in a dataset with mean 46 is decreased by 25%. What is the new mean?
A. 32.5
B. 36.5
C. 38.5
D. 34.5
Correct Answer: D
Mean decreases by the same 25%: 34.5.