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In a manufacturing process a random sample of 9 bolts manufactured has a mean length of 3cm with a variance of 0.09 Assuming bolt length

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In a manufacturing process a random sample of 9 bolts manufactured has a mean length of 3cm with a variance of 0.09 Assuming bolt length is normally distributed, what is the 90% confidence interval for the true mean length of the bolt? Select one: a. 2.4420 to 3.5580 O b. 2.8355 to 3.1645 O c. 2.9442 to 3,0558 G. d. 2.5065 to 3.4935 e. 2.8140 to 3.8160

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