csat-suneung 2009 Q7

csat-suneung · South-Korea · csat__math-humanities 3 marks Normal Distribution Sampling Distribution of the Mean
A company manufactures women's general handball balls certified by the International Handball Federation. The weight of handball balls produced by this company follows a normal distribution with mean 350 g and standard deviation 16 g. The company determines that there is a problem in the production process if the average weight of 64 randomly selected handball balls is 346 g or less, or 355 g or more. Using the standard normal distribution table below, what is the probability that the company determines there is a problem in the production process? [3 points]
$z$$\mathrm { P } ( 0 \leqq Z \leqq z )$
2.000.4772
2.250.4878
2.500.4938
2.750.4970

(1) 0.0290
(2) 0.0258
(3) 0.0184
(4) 0.0152
(5) 0.0092
A company manufactures women's general handball balls certified by the International Handball Federation. The weight of handball balls produced by this company follows a normal distribution with mean 350 g and standard deviation 16 g. The company determines that there is a problem in the production process if the average weight of 64 randomly selected handball balls is 346 g or less, or 355 g or more. Using the standard normal distribution table below, what is the probability that the company determines there is a problem in the production process? [3 points]

\begin{center}
\begin{tabular}{ | c | c | }
\hline
$z$ & $\mathrm { P } ( 0 \leqq Z \leqq z )$ \\
\hline
2.00 & 0.4772 \\
\hline
2.25 & 0.4878 \\
\hline
2.50 & 0.4938 \\
\hline
2.75 & 0.4970 \\
\hline
\end{tabular}
\end{center}

(1) 0.0290\\
(2) 0.0258\\
(3) 0.0184\\
(4) 0.0152\\
(5) 0.0092