a Photocopyirig machine broken; included as delay in the

a Photocopyirig machine broken; included as delay in the allowance factor.b Power outage; included as delay in the allowance factor.
(a) Compute the normal time for each work element.(b) If the allowance for this type of work is 15%, what is the standard time?(c) How many observations are needed for a 95% confidence level within 5% accuracy?