F(X) = 6
6 = 2(X+6) - 4
10 = 2(X+6)
5 = X+6
X = 5 - 6
X = -1.
Answer:


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:
A. . A cheeseburger is $7.95 plus $1.00 for each additional topping.
Step-by-step explanation: