Question

Probability of girl to be a racer is 4/5 What is the probability that 4 girls out of 5 are racer ?

(i) (4/5)⁴(1/5)

(ii) ⁵C₄(1/5)(4/5)

(iii) ⁵C₄(4/5)⁴(1/5)

(iv) none of thesae

Answer 1

Answer is (iii)

Probability that girl to eb a racer = 4/5

∴ Probability that girls in not be racer 

= 1 – 4/5 = 1/5

∴ Probability distribution of girls to be racer = (4/5 + 1/5)⁵ 

Probability that 4 girls are to be racer = ⁵C₄ (4/5)⁴ × (1/5)