Question

a letter of English alphabet is chosen at random determine the probability that the chosen letter is a consonant

Answer 1

vowels are 5 i.e consonants are 21
total alphabets are 26
therefore probability is required/total outcomes
i.e 21/26 or 80.7% (approx)

Answer 2

Total number of elementary events are= 26

Let E be the event of choosing a consonant

The favorable outcomes are: B, C, D, F, G, H, J, K, L, M, N, P, Q, R, S, T, V, W, X, Y, Z

Numbers of favorable outcomes are = 21

P (getting a consonant) = P (E) = 21/26