Question

11. Find the probability that a number selected at random from the numbers 1 to 25 is not a prime number when each of the
given numbers is equally likely to be selected


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Answer 1

25 is not a prime but 1 is normal number now

Answer 2

Answer:

Total no. of possible outcomes = 25 {1, 2, 3…. 25}

Favorable outcomes are 2, 3, 5, 7, 11, 13, 17, 19, 23

Number. of favorable outcomes = 9

Probability= Number of favorable outcomes/ Total number of outcomes

P(E) = 9/25

P(not E) = 1-9/25

= 16/25

Therefore, the probability of selecting a number which is not prime is 16/25.