$4$

$10$ points

$00$:$18$:$39$

References

How many observations should a stopwatch time$-$study analyst plan for in a task that has a standard deviation of $1\mathrm{.}5$ minutes per piece if the goal is to estimate the mean time per piece to within $0\mathrm{.}4$ minute with a confidence of $95\mathrm{.}5$ percent? $($Round the final answer to the next whole number.$)$

Observations

$00$:$18$:$39$

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