Mathematics, 31.12.2019 05:31 HecptyAura
Aprocess produces batches of a chemical whose impurity concentrations follow a normal distribution with a variance of175. a random sample of 20 of these batches is chosen. find the probability that the sample variance exceeds 3.10.
Answers: 3
![P(chi^2_{19}33.657)=1-P(\chi^2_{19]](/tpl/images/0438/0468/9dbf0.png)
is the sample variance 
, because 
and 
![E[\frac{(n-1) s^2}{\sigma^2}]= n-1](/tpl/images/0438/0468/19573.png)
![E[s^2]=\frac{n-1}{n-1}\sigma^2](/tpl/images/0438/0468/2d990.png)
![E[s^2]=\sigma^2](/tpl/images/0438/0468/4fd6b.png)
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Aprocess produces batches of a chemical whose impurity concentrations follow a normal distribution w...
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