A) Installing mufflers at the O'Sullivan Garage in Golden,

a) Installing mufflers at the O'Sullivan Garage in Golden, Colorado, involves five work elements. Jill O'Sullivan has timed workers performing these tasks seven times, with the results shown in the following table.

b) The number of observations that are required for a 90% confidence level within 5% accuracy = ___ observations (round your response to the immediate higher whole number).

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