4.73 An accident victim will die unless she receives in the next 10 minutes an amount of type A Rh

blood, which can be supplied by a single donor. It requires 2 minutes to “type” a prospective donor’s blood and 2 minutes to complete the transfer of blood. A large number of untyped donors are available, and 40% of them have type A Rh blood.

What is the probability that the accident victim will be saved if only one blood-typing kit is available?