Question $3(1$ point$)$

A bank's manager has videotaped $20$ different teller transactions to observe the number of mistakes being made. Ten transactions had no mistakes, five had one mistake and five had two mistakes. Compute upper control limits based on the cchart at $z=1\mathrm{.}65.$

$-0\mathrm{.}68$

$2\mathrm{.}18$

$0$

$3\mathrm{.}12$