Suppose there are three individuals $-$ ?John, Mary and Andy that made the following estimates of the cost of launching a new product: $ $7$ ?million, $ $2\mathrm{.}5$ ?million, and $ $4\mathrm{.}5$ ?million. John is considered the best judge and Andy the worst, therefore we decide to attach weights of John $0\mathrm{.}55,$ ?Mary $0\mathrm{.}30,$ ?and Andy $0\mathrm{.}15.$ ?What is the group estimates for the cost of launching the new product?

?

$5\mathrm{.}15$

?

$5\mathrm{.}5$

?

$5\mathrm{.}725$

?

$5\mathrm{.}275$