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3 years ago

A machinist can produce 114 parts in 6 mins.At this rate,how many parts can the machinist produce in 15 mins

1 answer:

5 0

$114\ parts\ in\ 6\ min\\\\
x\ parts\ in\ 15\ min\\\\
making\ proportion:\\
114-6\\
x-15\\\\cross\ multiplication\\\\
114*15=6x\\\\
1710=6x\ \ \ \ | divide\ by\ 6\\\\
x=285\\\\
285\ parts\ can\ be\ produced\ in\ 15min$

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Answer:

The 90% confidence level is $19.15< L < 20.85$

Step-by-step explanation:

From the question we are told that

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The standard deviation is $\sigma = 4 \ years$

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substituting values

$df = 64 - 1$

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$t_{df, \frac{ \alpha}{2} } = t_{63, 0.05 } = 1.669$

The margin for error is mathematically represented as

$MOE = t_{df , \frac{\alpha }{2} } * \frac{\sigma}{\sqrt{n} }$

substituting values

$MOE = 1.699 * \frac{4 }{\sqrt{64} }$

$MOE = 0.85$

he 90% confidence interval for the true average age of all students in the university is evaluated as follows

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3 years ago

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