|
4 articles trouvés pour ce sujet.
 |
|
|
|
|
|
|
|
|
The mean and variance |
2008-06-05 |
|
Donny pose la question :
An investment will be worth $1,000, $2,000, or $5,000 at the end of the
year. The probabilities of these values are .25, .60, and .15, respectively.
Determine the mean and variance of the worth of the investment.
Harley Weston lui répond. |
|
|
|
|
|
|
A probability distribution |
2008-03-23 |
|
Lorie pose la question :
The probabilities that a batch of 4 computers will contain 1, 2, 3, and 4 defective computers are 0.6274, 0.3102, 0.0575, and 0.001 respectively.
a. Set up a probability distribution to describe this situation.
Penny Nom lui répond. |
|
|
|
|
|
|
Expected value and standard deviation |
2008-03-19 |
|
Patrick pose la question :
Heres a question i cant figure out:
a small airline company has only three flights per day. The number of
delayed flights per day is regarded as a random variable, and I'm
supposed to calculate the expected
value and standard deviation of the number of delays.
the probability distribution looks like:
No. of Delays: 0 1 2 3
Prob. of delay: 05. 0.3 .1 .1
Harley Weston lui répond. |
|
|
|
|
|
|
A probability question |
2004-08-15 |
|
Gary pose la question :
In a law school class, the entering students averaged about 160 on the last
LSAT; the standard deviation was about 8. The historgram of the lLSAT
scores follwed the normal curve reasonable well.
Q. About what percentage of the class scored below 166?
Q. One student was 0.5 above average on the last LSAT, about what percentage
of the students had lower scores than he did?
Penny Nom lui répond. |
|
|
|
