Would it be 5 ? i’m sorry i’m not very sure.
You didnt include the (presumably) multiple choice answers. My guess is that the answer would be along the lines of: 20 - (P times .40)
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
.
-8 and 5: -8 x 5 = -40; -8 + 5 = -3
9514 1404 393
Answer:
A
Step-by-step explanation:
The only answer choice with 2 triangular faces and 3 rectangular faces is A, the triangular prism.