Let$$s Practice Weighted or Beta Distribution

E $=($ P $+$ O $+4$ M $)/6$

A team is estimating the cost to build a brick wall. The worst case is estimated to cost $$100,$ best case $$70,$ most likely is $$89.$ Calculate the estimated cost.

a$.$

$$87\mathrm{.}79$

b$.$

$$86\mathrm{.}33$

c$.$

$89\mathrm{.}33$

d$.$

$$87\mathrm{.}67$