Free Exam: stat 324 second mid-term exam-1
Number of Questions in Test: 49
Number of Questions in Preview: 5
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[size=4]A random sample of 15 people is taken from a population in which 40% favour a particular political stand. The probability that exactly 6 individuals in the sample favour this political stand is[/size]
| Type: | Multiple choice |
| Points: | 1 |
| Randomize answers: | Yes |
Question 2
[size=3]A random sample of 15 people is taken from a population in which 40% favour a particular political stand. The probability that at most one individuals in the sample favour this political stand is[/size]
| Type: | Multiple choice |
| Points: | 1 |
| Randomize answers: | Yes |
Question 3
[size=3]A random sample of 15 people is taken from a population in which 40% favour a particular political stand. The probability that at least 3 of individuals in the sample favour this political stand is[/size]
| Type: | Multiple choice |
| Points: | 1 |
| Randomize answers: | Yes |
Question 4
[size=3]The probability that a patient recovers from a delicate heart operation is p. If X random variable represent the number of patients recover from this operation among n patients.[/size]
[size=3]When n=1, then (E(X), Var(X)) are
[/size]
[size=3]When n=1, then (E(X), Var(X)) are
[/size]
| Type: | Multiple choice |
| Points: | 1 |
| Randomize answers: | Yes |
Question 5
[size=3]The probability that a patient recovers from a delicate heart operation is p. If X random variable represent the number of patients recover from this operation among n patients.
[/size]
[size=3]When n=10 and p=0.9, then (E(X), Var(X)) are [/size]
[/size]
[size=3]When n=10 and p=0.9, then (E(X), Var(X)) are [/size]
| Type: | Multiple choice |
| Points: | 1 |
| Randomize answers: | Yes |