Chapter 16: Probability

Q1. A die is thrown. Find the probability of getting a number less than 5.

Solution

Favorable outcomes: {1,2,3,4} = 4
P = 4/6 = 2/3

Q2. Two coins are tossed. Find P(at least one head).

Solution

Sample space: {HH, HT, TH, TT}
At least one head: {HH, HT, TH} = 3
P = 3/4

Q3. A card is drawn from a deck of 52. Find P(king or queen).

Solution

P(king) = 4/52, P(queen) = 4/52
P(king or queen) = 8/52 = 2/13