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The weights of 100 apples are categorized into bins.
Weight (g)
\(<100\)
\(100-120\)
\(120-140\)
\(>140\)
Freq
10
20
45
25
The sample mean is \(\bar{x}=128\) and sample standard deviation is \(s=18\).
Test at the \(5\pourcent\) level if the weights follow a Normal distribution.
Hint: Calculate expected frequencies using Normal CDF with sample statistics. Remember to adjust degrees of freedom.
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