Mathematics
Average / Arithmetic Mean
A dataset of 27 items has mean 67. Values 52 and 62 are replaced by 77 and 87. Find the new mean.
A. 67.85
B. 70.85
C. 69.85
D. 68.85
Correct Answer: D
Net total change = 50; new mean = 68.85.
Mathematics
Average / Arithmetic Mean
A dataset of 26 items has mean 66. Values 51 and 61 are replaced by 76 and 86. Find the new mean.
A. 68.92
B. 69.92
C. 67.92
D. 66.92
Correct Answer: C
Net total change = 50; new mean = 67.92.
Mathematics
Average / Arithmetic Mean
A dataset of 25 items has mean 65. Values 50 and 60 are replaced by 75 and 85. Find the new mean.
A. 69
B. 67
C. 66
D. 68
Correct Answer: B
Net total change = 50; new mean = 67.
Mathematics
Average / Arithmetic Mean
A dataset of 24 items has mean 64. Values 49 and 59 are replaced by 74 and 84. Find the new mean.
A. 67.08
B. 66.08
C. 68.08
D. 65.08
Correct Answer: B
Net total change = 50; new mean = 66.08.
Mathematics
Average / Arithmetic Mean
A dataset of 23 items has mean 63. Values 48 and 58 are replaced by 73 and 83. Find the new mean.
A. 64.17
B. 65.17
C. 67.17
D. 66.17
Correct Answer: B
Net total change = 50; new mean = 65.17.
Mathematics
Average / Arithmetic Mean
A dataset of 22 items has mean 62. Values 47 and 57 are replaced by 72 and 82. Find the new mean.
A. 64.27
B. 65.27
C. 63.27
D. 66.27
Correct Answer: A
Net total change = 50; new mean = 64.27.
Mathematics
Average / Arithmetic Mean
A dataset of 21 items has mean 61. Values 46 and 56 are replaced by 71 and 81. Find the new mean.
A. 64.38
B. 65.38
C. 62.38
D. 63.38
Correct Answer: D
Net total change = 50; new mean = 63.38.
Mathematics
Average / Arithmetic Mean
A dataset of 20 items has mean 60. Values 45 and 55 are replaced by 70 and 80. Find the new mean.
A. 64.5
B. 61.5
C. 63.5
D. 62.5
Correct Answer: D
Net total change = 50; new mean = 62.5.
Mathematics
Average / Arithmetic Mean
A set of 24 values has mean 59. When 98 is included, what is the resulting mean?
A. 59.56
B. 61.56
C. 60.56
D. 62.56
Correct Answer: C
Resulting mean = (24×59+98)/25 = 60.56.
Mathematics
Average / Arithmetic Mean
A set of 23 values has mean 58. When 96 is included, what is the resulting mean?
A. 61.58
B. 60.58
C. 58.58
D. 59.58
Correct Answer: D
Resulting mean = (23×58+96)/24 = 59.58.
Mathematics
Average / Arithmetic Mean
A set of 22 values has mean 57. When 94 is included, what is the resulting mean?
A. 59.61
B. 57.61
C. 58.61
D. 60.61
Correct Answer: C
Resulting mean = (22×57+94)/23 = 58.61.
Mathematics
Average / Arithmetic Mean
A set of 21 values has mean 56. When 92 is included, what is the resulting mean?
A. 58.64
B. 59.64
C. 57.64
D. 56.64
Correct Answer: C
Resulting mean = (21×56+92)/22 = 57.64.
Mathematics
Average / Arithmetic Mean
A set of 20 values has mean 55. When 90 is included, what is the resulting mean?
A. 58.67
B. 55.67
C. 57.67
D. 56.67
Correct Answer: D
Resulting mean = (20×55+90)/21 = 56.67.
Mathematics
Average / Arithmetic Mean
A set of 19 values has mean 54. When 88 is included, what is the resulting mean?
A. 57.7
B. 54.7
C. 56.7
D. 55.7
Correct Answer: D
Resulting mean = (19×54+88)/20 = 55.7.
Mathematics
Average / Arithmetic Mean
A set of 18 values has mean 53. When 86 is included, what is the resulting mean?
A. 54.74
B. 55.74
C. 56.74
D. 53.74
Correct Answer: A
Resulting mean = (18×53+86)/19 = 54.74.
Mathematics
Average / Arithmetic Mean
A set of 17 values has mean 52. When 84 is included, what is the resulting mean?
A. 53.78
B. 55.78
C. 54.78
D. 52.78
Correct Answer: A
Resulting mean = (17×52+84)/18 = 53.78.
Mathematics
Average / Arithmetic Mean
A set of 16 values has mean 51. When 82 is included, what is the resulting mean?
A. 54.82
B. 51.82
C. 52.82
D. 53.82
Correct Answer: C
Resulting mean = (16×51+82)/17 = 52.82.
Mathematics
Average / Arithmetic Mean
A set of 15 values has mean 50. When 80 is included, what is the resulting mean?
A. 52.88
B. 51.88
C. 50.88
D. 53.88
Correct Answer: B
Resulting mean = (15×50+80)/16 = 51.88.
Mathematics
Average / Arithmetic Mean
The first 21 positive even numbers have what average?
A. 24
B. 22
C. 26
D. 20
Correct Answer: B
Mean = (2+42)/2 = 22.
Mathematics
Average / Arithmetic Mean
The first 20 positive odd numbers have what average?
A. 20
B. 22
C. 18
D. 24
Correct Answer: A
Mean = (1+39)/2 = 20.