|
| quote: | Originally posted by DJ_Science
I hope this makes sense...
> 1. A normal distribution has a mean of 80 and a standard deviation
> of 14. Determine the value above which 80 percent of the values will > occur.
You need a table for this one. Its about 68.3. Basically you want to look at z&sigma for which a one tailed test gives 20 percent outside. They key to this is a one tailed test. then &mu - z&sigma is the value above which 80% will fall.
> d) What is the probability that 8 and 10 bottles are defectives?
at the Prob for 8 and 10 only, P = 0.08158677208886
> e) What is the probability that there are exactly 8 defectives?
0.10602553736479 same as above, but only the n = 8 term counts
> f) What is the probability that there are no defectives?
0.00592052922033 n = 0 term only |
Shit, you beat me to it, looks like the problem is solved, maybe next time.
|