Reference no: EM132522823
The following measurements were recorded for the duration, in seconds, of phone calls in a call-center of a major corporation:
30 32 27 20
32 30 26 30
33 29
1. the mode of the dataset is:
a) 26 s b) 27 s c) 30 s d) 32 s e) 33 s
2. The median of the dataset is:
a) 30.15 s b) 28.9 s c) 30 s d) 28.9 s2 e) 30 s2
3. The mean of the duration of the phone call is:
a) 30.15 s2 b) 28.9 s c) 30.15 s d) 30 s e) 28.9 s2
4. The variance of the dataset is:
a) 28.9 s b) 14.54 s c) 3.81 s d) 14.54 s2 e) 3.81 s2
5. The third quartile of the dataset is:
a) 20 s b) 27 s c) 30 s d) 32 s e) 33 s
6. the 20% trimmed mean is:
a) 28.67 s b) 29.67 s c) 28.5 s d) 29.5 d e) 30 s
The two events A and B are independent. Hence:
7. The relation P[A] = P[A|B] necessarily applies.
a) True b) False
8. The relation P[B] = P[B|A] necessarily applies.
a) True b) False
9. The relation P[A∩B] = P[A]P[B] necessarily applies.
a) True b) False
10. The relation P[A∩B] = Ø necessarily applies.
a) True b) False
11) If A and B are also mutually exclusive, then the relation P[A∩B] = Ø necessarily applies.
a) True b) False
12. If A and B are also mutually exclusive, then P[A U B] =P[A] + P[B] necessarily applies.
a) True b) False