Question

A die is rolled 100 times and the number appearing on the top face of the die is noted. The data is tabulated as follows:

Number	Frequency
1	20
2	10
3	20
4	30
5	10
6	10

What is the probability of getting a number equal to or less than 3?

• A. 0.6
• B. 0.5
• C. 0.55
• D. 0.45

Answer 1

The correct option is B 0.5

We know, for an event E,
P(E) = $\frac{\text{Number of trials in which the event happened}}{\text{Total number of trials}}$

Here, the event is getting a number less than or equal to 3.
Hence, the number of trials where the event took place
= Frequency of 1 + Frequency of 2 + Frequency of 3
= 20 + 10 + 20
= 50
$\therefore$ The required probability
$=\frac{50}{100}=\frac{1}{2}=0.5$