Mathematics
Average / Arithmetic Mean
A dataset has mean 22. Every value is first multiplied by 4 and then increased by 3. What is the new mean?
A. 91
B. 88
C. 97
D. 94
Correct Answer: A
New mean = 4×22+3 = 91.
Mathematics
Average / Arithmetic Mean
A dataset has mean 21. Every value is first multiplied by 3 and then increased by 2. What is the new mean?
A. 65
B. 68
C. 71
D. 62
Correct Answer: A
New mean = 3×21+2 = 65.
Mathematics
Average / Arithmetic Mean
A dataset has mean 20. Every value is first multiplied by 2 and then increased by 1. What is the new mean?
A. 41
B. 38
C. 47
D. 44
Correct Answer: A
New mean = 2×20+1 = 41.
Mathematics
Average / Arithmetic Mean
The sum of a set is 320 and its mean is 32. How many observations are in the set?
A. 10
B. 11
C. 12
D. 9
Correct Answer: A
Count = Sum ÷ Mean = 320 ÷ 32 = 10.
Mathematics
Average / Arithmetic Mean
The sum of a set is 270 and its mean is 30. How many observations are in the set?
A. 10
B. 11
C. 8
D. 9
Correct Answer: D
Count = Sum ÷ Mean = 270 ÷ 30 = 9.
Mathematics
Average / Arithmetic Mean
The sum of a set is 224 and its mean is 28. How many observations are in the set?
A. 9
B. 7
C. 8
D. 10
Correct Answer: C
Count = Sum ÷ Mean = 224 ÷ 28 = 8.
Mathematics
Average / Arithmetic Mean
The sum of a set is 182 and its mean is 26. How many observations are in the set?
A. 8
B. 7
C. 6
D. 9
Correct Answer: B
Count = Sum ÷ Mean = 182 ÷ 26 = 7.
Mathematics
Average / Arithmetic Mean
The sum of a set is 288 and its mean is 24. How many observations are in the set?
A. 11
B. 14
C. 12
D. 13
Correct Answer: C
Count = Sum ÷ Mean = 288 ÷ 24 = 12.
Mathematics
Average / Arithmetic Mean
The sum of a set is 242 and its mean is 22. How many observations are in the set?
A. 11
B. 10
C. 13
D. 12
Correct Answer: A
Count = Sum ÷ Mean = 242 ÷ 22 = 11.
Mathematics
Average / Arithmetic Mean
The sum of a set is 200 and its mean is 20. How many observations are in the set?
A. 12
B. 9
C. 10
D. 11
Correct Answer: C
Count = Sum ÷ Mean = 200 ÷ 20 = 10.
Mathematics
Average / Arithmetic Mean
The sum of a set is 162 and its mean is 18. How many observations are in the set?
A. 8
B. 11
C. 9
D. 10
Correct Answer: C
Count = Sum ÷ Mean = 162 ÷ 18 = 9.
Mathematics
Average / Arithmetic Mean
The sum of a set is 128 and its mean is 16. How many observations are in the set?
A. 9
B. 8
C. 10
D. 7
Correct Answer: B
Count = Sum ÷ Mean = 128 ÷ 16 = 8.
Mathematics
Average / Arithmetic Mean
The sum of a set is 98 and its mean is 14. How many observations are in the set?
A. 7
B. 9
C. 8
D. 6
Correct Answer: A
Count = Sum ÷ Mean = 98 ÷ 14 = 7.
Mathematics
Average / Arithmetic Mean
A dataset contains 8 observations whose sum is 396. Determine its mean.
A. 49.5
B. 51.5
C. 47.5
D. 53.5
Correct Answer: A
Mean = 396 ÷ 8 = 49.5.
Mathematics
Average / Arithmetic Mean
A dataset contains 7 observations whose sum is 372. Determine its mean.
A. 51.14
B. 55.14
C. 53.14
D. 57.14
Correct Answer: C
Mean = 372 ÷ 7 = 53.14.
Mathematics
Average / Arithmetic Mean
A dataset contains 6 observations whose sum is 348. Determine its mean.
A. 62
B. 56
C. 60
D. 58
Correct Answer: D
Mean = 348 ÷ 6 = 58.
Mathematics
Average / Arithmetic Mean
A dataset contains 12 observations whose sum is 324. Determine its mean.
A. 27
B. 25
C. 31
D. 29
Correct Answer: A
Mean = 324 ÷ 12 = 27.
Mathematics
Average / Arithmetic Mean
A dataset contains 11 observations whose sum is 300. Determine its mean.
A. 25.27
B. 31.27
C. 29.27
D. 27.27
Correct Answer: D
Mean = 300 ÷ 11 = 27.27.
Mathematics
Average / Arithmetic Mean
A dataset contains 10 observations whose sum is 276. Determine its mean.
A. 31.6
B. 25.6
C. 29.6
D. 27.6
Correct Answer: D
Mean = 276 ÷ 10 = 27.6.
Mathematics
Average / Arithmetic Mean
A dataset contains 9 observations whose sum is 252. Determine its mean.
A. 30
B. 28
C. 26
D. 32
Correct Answer: B
Mean = 252 ÷ 9 = 28.