- #1
superwolf
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Homework Statement
If all possible samples of size 16 are drawn from a normal population with mean equal to 50 and standard deviation equal to 5, what is the probability that a sample mean [tex]\bar{X}[/tex] will fall in the interval from [tex]\mu_\bar{X} - 1.9 \sigma_\bar{X}[/tex] to [tex]\mu_\bar{X}-0.4\sigma_\bar{X}[/tex]?
2. The attempt at a solution
[tex]
Z=\frac{\bar X - \mu}{\sigma /sqrt{n}}
[/tex]