Question

A number is chosen at random from 1 to 25 find the probability of selecting a composite number

Answer 1

S={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,
19,20,21,22,23,24,25}
n(S)=25
(A):composite numbers
S(A)={4,6,8,9,10,12,14,15,16,18,20,21,22,24,
25}
n(A)=15
probability of getting composite numbers=n(A)/n(S)
=15/25
=3/5
= 0.6

Answer 2

Probability of selecting a composite number = 0.6

Given:

A number is chosen at random from 1 to 25.

To find:

The probability of selecting a composite number.

Explanation:

Numbers from 1 to 25

Total numbers are 25 so sample size = n(s) = 25

So sample size of composite number from  1 to 25 = n(p)

                 {4,6,8,9,10,12,14,15,16,18,20,21,22,24,25}

1 is nigher prime nor composite,

n(p) = 15

Probability of selecting a composite number = $\frac{n(p)}{n(s)}$ = $\frac{15}{25}$ = 0.6

Probability of selecting a composite number = 0.6

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