Item$9$

$10$

points

Return to questionItem $9$

An analyst made the following observations about whether customer service representatives were busy $($B$)$ or idle $($I$)$:

Observation $1234567891011121314151617181920$

Busy or idle B B I B I B B B I B B B B I B B B B B I

a$.$ What is the percentage of idle time?

Idle time $95$ Numeric Response $1.$Edit Unavailable. $95$ incorrect.$\%$

b$.$ Given these results, how many observations would be needed to estimate the actual percentage of idle time to within $6$ percent with a confidence of $90$ percent? $($Round the final answer to the next whole number.$)$

Observations $165$