Mathematics
Average / Arithmetic Mean
The first 19 positive even numbers have what average?
A. 22
B. 20
C. 24
D. 18
Correct Answer: B
Mean = (2+38)/2 = 20.
Mathematics
Average / Arithmetic Mean
The first 18 positive odd numbers have what average?
A. 22
B. 18
C. 20
D. 16
Correct Answer: B
Mean = (1+35)/2 = 18.
Mathematics
Average / Arithmetic Mean
The first 17 positive even numbers have what average?
A. 16
B. 22
C. 20
D. 18
Correct Answer: D
Mean = (2+34)/2 = 18.
Mathematics
Average / Arithmetic Mean
The first 16 positive odd numbers have what average?
A. 18
B. 14
C. 16
D. 20
Correct Answer: C
Mean = (1+31)/2 = 16.
Mathematics
Average / Arithmetic Mean
The first 15 positive even numbers have what average?
A. 18
B. 20
C. 16
D. 14
Correct Answer: C
Mean = (2+30)/2 = 16.
Mathematics
Average / Arithmetic Mean
The first 14 positive odd numbers have what average?
A. 18
B. 14
C. 16
D. 12
Correct Answer: B
Mean = (1+27)/2 = 14.
Mathematics
Average / Arithmetic Mean
The first 13 positive even numbers have what average?
A. 18
B. 14
C. 12
D. 16
Correct Answer: B
Mean = (2+26)/2 = 14.
Mathematics
Average / Arithmetic Mean
The first 12 positive odd numbers have what average?
A. 12
B. 16
C. 14
D. 10
Correct Answer: A
Mean = (1+23)/2 = 12.
Mathematics
Average / Arithmetic Mean
An arithmetic sequence has 12 terms, first term 14, and mean 36. What is its last term?
A. 62
B. 56
C. 58
D. 60
Correct Answer: C
Last = 2×mean − first = 2×36−14 = 58.
Mathematics
Average / Arithmetic Mean
An arithmetic sequence has 11 terms, first term 13, and mean 43. What is its last term?
A. 77
B. 75
C. 71
D. 73
Correct Answer: D
Last = 2×mean − first = 2×43−13 = 73.
Mathematics
Average / Arithmetic Mean
An arithmetic sequence has 10 terms, first term 12, and mean 34.5. What is its last term?
A. 57
B. 55
C. 61
D. 59
Correct Answer: A
Last = 2×mean − first = 2×34.5−12 = 57.
Mathematics
Average / Arithmetic Mean
An arithmetic sequence has 9 terms, first term 11, and mean 27. What is its last term?
A. 47
B. 43
C. 41
D. 45
Correct Answer: B
Last = 2×mean − first = 2×27−11 = 43.
Mathematics
Average / Arithmetic Mean
An arithmetic sequence has 8 terms, first term 10, and mean 31. What is its last term?
A. 56
B. 50
C. 52
D. 54
Correct Answer: C
Last = 2×mean − first = 2×31−10 = 52.
Mathematics
Average / Arithmetic Mean
An arithmetic sequence has 12 terms, first term 9, and mean 36.5. What is its last term?
A. 64
B. 62
C. 68
D. 66
Correct Answer: A
Last = 2×mean − first = 2×36.5−9 = 64.
Mathematics
Average / Arithmetic Mean
An arithmetic sequence has 11 terms, first term 8, and mean 28. What is its last term?
A. 46
B. 52
C. 50
D. 48
Correct Answer: D
Last = 2×mean − first = 2×28−8 = 48.
Mathematics
Average / Arithmetic Mean
An arithmetic sequence has 10 terms, first term 7, and mean 34. What is its last term?
A. 65
B. 61
C. 59
D. 63
Correct Answer: B
Last = 2×mean − first = 2×34−7 = 61.
Mathematics
Average / Arithmetic Mean
An arithmetic sequence has 9 terms, first term 6, and mean 26. What is its last term?
A. 48
B. 44
C. 50
D. 46
Correct Answer: D
Last = 2×mean − first = 2×26−6 = 46.
Mathematics
Average / Arithmetic Mean
An arithmetic sequence has 8 terms, first term 5, and mean 19. What is its last term?
A. 37
B. 33
C. 35
D. 31
Correct Answer: B
Last = 2×mean − first = 2×19−5 = 33.
Mathematics
Average / Arithmetic Mean
Seven consecutive odd integers start at 47. What is their arithmetic mean?
A. 51
B. 55
C. 57
D. 53
Correct Answer: D
Last term = 59; mean = (47+59)/2 = 53.
Mathematics
Average / Arithmetic Mean
Seven consecutive odd integers start at 43. What is their arithmetic mean?
A. 51
B. 47
C. 53
D. 49
Correct Answer: D
Last term = 55; mean = (43+55)/2 = 49.