Answer:
12.9 hours.
Step-by-step explanation:
First, do 2.15 hours multiplied by 2, for each day. Then, multiply 4.30 by the 3 for 3 weeks.
Answer: 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
.
Answer:
m=2
Step-by-step explanation:
use points (2,2) and (6,10)
(find y of slope)10-2=8
(find x of slope)6-2=4
8/4=2