Question

“M” and “N” are two events P(M) = 0.70, P(N) = 0.50, P(M and

N) = 0.40. Find the probability of P(M or N)

A) 0.90
B) 0.70
C) 0.80
D) 1.20

Answer 1

`P(M\ or\ N) = 0.80`

Explanation:

Given

`P(M) = 0.70`

`P(N) = 0.50`

`P(M\ and\ N) = 0.40`

Required

Calculate P(M or N)

This is calculated using:

`P(M\ or\ N) = P(M) + P(N) - P(M\ and\ N)`

The equation becomes

`P(M\ or\ N) = 0.70 + 0.50 - 0.40`

`P(M\ or\ N) = 0.80`