Answer: 4c-4<8 = c<3 9x+5>23= x>2
(2,3)
Step-by-step explanation:
The event that either M1 or M2 fails has probability
by the addition rule. Failure events are independent, so
so that
Denote this probability by . Then follows a geometric distribution with this parameter and has density
The expectation is .
Ok bet I got you say less